Lock ASP.NET Page and Show Animated Image While Waiting for a Long Post-Back

/*
Copyright (c) 2009, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
version: 2.7.0
*/
YAHOO.util.CustomEvent=function(D,C,B,A){this.type=D;this.scope=C||window;this.silent=B;this.signature=A||YAHOO.util.CustomEvent.LIST;this.subscribers=[];if(!this.silent){}var E="_YUICEOnSubscribe";if(D!==E){this.subscribeEvent=new YAHOO.util.CustomEvent(E,this,true);}this.lastError=null;};YAHOO.util.CustomEvent.LIST=0;YAHOO.util.CustomEvent.FLAT=1;YAHOO.util.CustomEvent.prototype={subscribe:function(A,B,C){if(!A){throw new Error("Invalid callback for subscriber to '"+this.type+"'");}if(this.subscribeEvent){this.subscribeEvent.fire(A,B,C);}this.subscribers.push(new YAHOO.util.Subscriber(A,B,C));},unsubscribe:function(D,F){if(!D){return this.unsubscribeAll();}var E=false;for(var B=0,A=this.subscribers.length;B<A;++B){var C=this.subscribers[B];if(C&&C.contains(D,F)){this._delete(B);E=true;}}return E;},fire:function(){this.lastError=null;var K=[],E=this.subscribers.length;if(!E&&this.silent){return true;}var I=[].slice.call(arguments,0),G=true,D,J=false;if(!this.silent){}var C=this.subscribers.slice(),A=YAHOO.util.Event.throwErrors;for(D=0;D<E;++D){var M=C[D];if(!M){J=true;}else{if(!this.silent){}var L=M.getScope(this.scope);if(this.signature==YAHOO.util.CustomEvent.FLAT){var B=null;if(I.length>0){B=I[0];}try{G=M.fn.call(L,B,M.obj);}catch(F){this.lastError=F;if(A){throw F;}}}else{try{G=M.fn.call(L,this.type,I,M.obj);}catch(H){this.lastError=H;if(A){throw H;}}}if(false===G){if(!this.silent){}break;}}}return(G!==false);},unsubscribeAll:function(){var A=this.subscribers.length,B;for(B=A-1;B>-1;B--){this._delete(B);}this.subscribers=[];return A;},_delete:function(A){var B=this.subscribers[A];if(B){delete B.fn;delete B.obj;}this.subscribers.splice(A,1);},toString:function(){return"CustomEvent: "+"'"+this.type+"', "+"context: "+this.scope;}};YAHOO.util.Subscriber=function(A,B,C){this.fn=A;this.obj=YAHOO.lang.isUndefined(B)?null:B;this.overrideContext=C;};YAHOO.util.Subscriber.prototype.getScope=function(A){if(this.overrideContext){if(this.overrideContext===true){return this.obj;}else{return this.overrideContext;}}return A;};YAHOO.util.Subscriber.prototype.contains=function(A,B){if(B){return(this.fn==A&&this.obj==B);}else{return(this.fn==A);}};YAHOO.util.Subscriber.prototype.toString=function(){return"Subscriber { obj: "+this.obj+", overrideContext: "+(this.overrideContext||"no")+" }";};if(!YAHOO.util.Event){YAHOO.util.Event=function(){var H=false;var I=[];var J=[];var G=[];var E=[];var C=0;var F=[];var B=[];var A=0;var D={63232:38,63233:40,63234:37,63235:39,63276:33,63277:34,25:9};var K=YAHOO.env.ua.ie?"focusin":"focus";var L=YAHOO.env.ua.ie?"focusout":"blur";return{POLL_RETRYS:2000,POLL_INTERVAL:20,EL:0,TYPE:1,FN:2,WFN:3,UNLOAD_OBJ:3,ADJ_SCOPE:4,OBJ:5,OVERRIDE:6,lastError:null,isSafari:YAHOO.env.ua.webkit,webkit:YAHOO.env.ua.webkit,isIE:YAHOO.env.ua.ie,_interval:null,_dri:null,DOMReady:false,throwErrors:false,startInterval:function(){if(!this._interval){var M=this;var N=function(){M._tryPreloadAttach();};this._interval=setInterval(N,this.POLL_INTERVAL);}},onAvailable:function(S,O,Q,R,P){var M=(YAHOO.lang.isString(S))?[S]:S;for(var N=0;N<M.length;N=N+1){F.push({id:M[N],fn:O,obj:Q,overrideContext:R,checkReady:P});}C=this.POLL_RETRYS;this.startInterval();},onContentReady:function(P,M,N,O){this.onAvailable(P,M,N,O,true);},onDOMReady:function(M,N,O){if(this.DOMReady){setTimeout(function(){var P=window;if(O){if(O===true){P=N;}else{P=O;}}M.call(P,"DOMReady",[],N);},0);}else{this.DOMReadyEvent.subscribe(M,N,O);}},_addListener:function(O,M,Y,S,W,b){if(!Y||!Y.call){return false;}if(this._isValidCollection(O)){var Z=true;for(var T=0,V=O.length;T<V;++T){Z=this.on(O[T],M,Y,S,W)&&Z;}return Z;}else{if(YAHOO.lang.isString(O)){var R=this.getEl(O);if(R){O=R;}else{this.onAvailable(O,function(){YAHOO.util.Event.on(O,M,Y,S,W);});return true;}}}if(!O){return false;}if("unload"==M&&S!==this){J[J.length]=[O,M,Y,S,W];return true;}var N=O;if(W){if(W===true){N=S;}else{N=W;}}var P=function(c){return Y.call(N,YAHOO.util.Event.getEvent(c,O),S);};var a=[O,M,Y,P,N,S,W];var U=I.length;I[U]=a;if(this.useLegacyEvent(O,M)){var Q=this.getLegacyIndex(O,M);if(Q==-1||O!=G[Q][0]){Q=G.length;B[O.id+M]=Q;G[Q]=[O,M,O["on"+M]];E[Q]=[];O["on"+M]=function(c){YAHOO.util.Event.fireLegacyEvent(YAHOO.util.Event.getEvent(c),Q);};}E[Q].push(a);}else{try{this._simpleAdd(O,M,P,b);}catch(X){this.lastError=X;this.removeListener(O,M,Y);return false;}}return true;},addListener:function(N,Q,M,O,P){return this._addListener(N,Q,M,O,P,false);},addFocusListener:function(N,M,O,P){return this._addListener(N,K,M,O,P,true);},removeFocusListener:function(N,M){return this.removeListener(N,K,M);},addBlurListener:function(N,M,O,P){return this._addListener(N,L,M,O,P,true);},removeBlurListener:function(N,M){return this.removeListener(N,L,M);},fireLegacyEvent:function(R,P){var T=true,M,V,U,N,S;V=E[P].slice();for(var O=0,Q=V.length;O<Q;++O){U=V[O];if(U&&U[this.WFN]){N=U[this.ADJ_SCOPE];S=U[this.WFN].call(N,R);T=(T&&S);}}M=G[P];if(M&&M[2]){M[2](R);}return T;},getLegacyIndex:function(N,O){var M=this.generateId(N)+O;if(typeof B[M]=="undefined"){return -1;}else{return B[M];}},useLegacyEvent:function(M,N){return(this.webkit&&this.webkit<419&&("click"==N||"dblclick"==N));},removeListener:function(N,M,V){var Q,T,X;if(typeof N=="string"){N=this.getEl(N);}else{if(this._isValidCollection(N)){var W=true;for(Q=N.length-1;Q>-1;Q--){W=(this.removeListener(N[Q],M,V)&&W);}return W;}}if(!V||!V.call){return this.purgeElement(N,false,M);}if("unload"==M){for(Q=J.length-1;Q>-1;Q--){X=J[Q];if(X&&X[0]==N&&X[1]==M&&X[2]==V){J.splice(Q,1);return true;}}return false;}var R=null;var S=arguments[3];if("undefined"===typeof S){S=this._getCacheIndex(N,M,V);}if(S>=0){R=I[S];}if(!N||!R){return false;}if(this.useLegacyEvent(N,M)){var P=this.getLegacyIndex(N,M);var O=E[P];if(O){for(Q=0,T=O.length;Q<T;++Q){X=O[Q];if(X&&X[this.EL]==N&&X[this.TYPE]==M&&X[this.FN]==V){O.splice(Q,1);break;}}}}else{try{this._simpleRemove(N,M,R[this.WFN],false);}catch(U){this.lastError=U;return false;}}delete I[S][this.WFN];delete I[S][this.FN];
I.splice(S,1);return true;},getTarget:function(O,N){var M=O.target||O.srcElement;return this.resolveTextNode(M);},resolveTextNode:function(N){try{if(N&&3==N.nodeType){return N.parentNode;}}catch(M){}return N;},getPageX:function(N){var M=N.pageX;if(!M&&0!==M){M=N.clientX||0;if(this.isIE){M+=this._getScrollLeft();}}return M;},getPageY:function(M){var N=M.pageY;if(!N&&0!==N){N=M.clientY||0;if(this.isIE){N+=this._getScrollTop();}}return N;},getXY:function(M){return[this.getPageX(M),this.getPageY(M)];},getRelatedTarget:function(N){var M=N.relatedTarget;if(!M){if(N.type=="mouseout"){M=N.toElement;}else{if(N.type=="mouseover"){M=N.fromElement;}}}return this.resolveTextNode(M);},getTime:function(O){if(!O.time){var N=new Date().getTime();try{O.time=N;}catch(M){this.lastError=M;return N;}}return O.time;},stopEvent:function(M){this.stopPropagation(M);this.preventDefault(M);},stopPropagation:function(M){if(M.stopPropagation){M.stopPropagation();}else{M.cancelBubble=true;}},preventDefault:function(M){if(M.preventDefault){M.preventDefault();}else{M.returnValue=false;}},getEvent:function(O,M){var N=O||window.event;if(!N){var P=this.getEvent.caller;while(P){N=P.arguments[0];if(N&&Event==N.constructor){break;}P=P.caller;}}return N;},getCharCode:function(N){var M=N.keyCode||N.charCode||0;if(YAHOO.env.ua.webkit&&(M in D)){M=D[M];}return M;},_getCacheIndex:function(Q,R,P){for(var O=0,N=I.length;O<N;O=O+1){var M=I[O];if(M&&M[this.FN]==P&&M[this.EL]==Q&&M[this.TYPE]==R){return O;}}return -1;},generateId:function(M){var N=M.id;if(!N){N="yuievtautoid-"+A;++A;M.id=N;}return N;},_isValidCollection:function(N){try{return(N&&typeof N!=="string"&&N.length&&!N.tagName&&!N.alert&&typeof N[0]!=="undefined");}catch(M){return false;}},elCache:{},getEl:function(M){return(typeof M==="string")?document.getElementById(M):M;},clearCache:function(){},DOMReadyEvent:new YAHOO.util.CustomEvent("DOMReady",this),_load:function(N){if(!H){H=true;var M=YAHOO.util.Event;M._ready();M._tryPreloadAttach();}},_ready:function(N){var M=YAHOO.util.Event;if(!M.DOMReady){M.DOMReady=true;M.DOMReadyEvent.fire();M._simpleRemove(document,"DOMContentLoaded",M._ready);}},_tryPreloadAttach:function(){if(F.length===0){C=0;if(this._interval){clearInterval(this._interval);this._interval=null;}return;}if(this.locked){return;}if(this.isIE){if(!this.DOMReady){this.startInterval();return;}}this.locked=true;var S=!H;if(!S){S=(C>0&&F.length>0);}var R=[];var T=function(V,W){var U=V;if(W.overrideContext){if(W.overrideContext===true){U=W.obj;}else{U=W.overrideContext;}}W.fn.call(U,W.obj);};var N,M,Q,P,O=[];for(N=0,M=F.length;N<M;N=N+1){Q=F[N];if(Q){P=this.getEl(Q.id);if(P){if(Q.checkReady){if(H||P.nextSibling||!S){O.push(Q);F[N]=null;}}else{T(P,Q);F[N]=null;}}else{R.push(Q);}}}for(N=0,M=O.length;N<M;N=N+1){Q=O[N];T(this.getEl(Q.id),Q);}C--;if(S){for(N=F.length-1;N>-1;N--){Q=F[N];if(!Q||!Q.id){F.splice(N,1);}}this.startInterval();}else{if(this._interval){clearInterval(this._interval);this._interval=null;}}this.locked=false;},purgeElement:function(Q,R,T){var O=(YAHOO.lang.isString(Q))?this.getEl(Q):Q;var S=this.getListeners(O,T),P,M;if(S){for(P=S.length-1;P>-1;P--){var N=S[P];this.removeListener(O,N.type,N.fn);}}if(R&&O&&O.childNodes){for(P=0,M=O.childNodes.length;P<M;++P){this.purgeElement(O.childNodes[P],R,T);}}},getListeners:function(O,M){var R=[],N;if(!M){N=[I,J];}else{if(M==="unload"){N=[J];}else{N=[I];}}var T=(YAHOO.lang.isString(O))?this.getEl(O):O;for(var Q=0;Q<N.length;Q=Q+1){var V=N[Q];if(V){for(var S=0,U=V.length;S<U;++S){var P=V[S];if(P&&P[this.EL]===T&&(!M||M===P[this.TYPE])){R.push({type:P[this.TYPE],fn:P[this.FN],obj:P[this.OBJ],adjust:P[this.OVERRIDE],scope:P[this.ADJ_SCOPE],index:S});}}}}return(R.length)?R:null;},_unload:function(T){var N=YAHOO.util.Event,Q,P,O,S,R,U=J.slice(),M;for(Q=0,S=J.length;Q<S;++Q){O=U[Q];if(O){M=window;if(O[N.ADJ_SCOPE]){if(O[N.ADJ_SCOPE]===true){M=O[N.UNLOAD_OBJ];}else{M=O[N.ADJ_SCOPE];}}O[N.FN].call(M,N.getEvent(T,O[N.EL]),O[N.UNLOAD_OBJ]);U[Q]=null;}}O=null;M=null;J=null;if(I){for(P=I.length-1;P>-1;P--){O=I[P];if(O){N.removeListener(O[N.EL],O[N.TYPE],O[N.FN],P);}}O=null;}G=null;N._simpleRemove(window,"unload",N._unload);},_getScrollLeft:function(){return this._getScroll()[1];},_getScrollTop:function(){return this._getScroll()[0];},_getScroll:function(){var M=document.documentElement,N=document.body;if(M&&(M.scrollTop||M.scrollLeft)){return[M.scrollTop,M.scrollLeft];}else{if(N){return[N.scrollTop,N.scrollLeft];}else{return[0,0];}}},regCE:function(){},_simpleAdd:function(){if(window.addEventListener){return function(O,P,N,M){O.addEventListener(P,N,(M));};}else{if(window.attachEvent){return function(O,P,N,M){O.attachEvent("on"+P,N);};}else{return function(){};}}}(),_simpleRemove:function(){if(window.removeEventListener){return function(O,P,N,M){O.removeEventListener(P,N,(M));};}else{if(window.detachEvent){return function(N,O,M){N.detachEvent("on"+O,M);};}else{return function(){};}}}()};}();(function(){var EU=YAHOO.util.Event;EU.on=EU.addListener;EU.onFocus=EU.addFocusListener;EU.onBlur=EU.addBlurListener;
/* DOMReady: based on work by: Dean Edwards/John Resig/Matthias Miller */
if(EU.isIE){YAHOO.util.Event.onDOMReady(YAHOO.util.Event._tryPreloadAttach,YAHOO.util.Event,true);var n=document.createElement("p");EU._dri=setInterval(function(){try{n.doScroll("left");clearInterval(EU._dri);EU._dri=null;EU._ready();n=null;}catch(ex){}},EU.POLL_INTERVAL);}else{if(EU.webkit&&EU.webkit<525){EU._dri=setInterval(function(){var rs=document.readyState;if("loaded"==rs||"complete"==rs){clearInterval(EU._dri);EU._dri=null;EU._ready();}},EU.POLL_INTERVAL);}else{EU._simpleAdd(document,"DOMContentLoaded",EU._ready);}}EU._simpleAdd(window,"load",EU._load);EU._simpleAdd(window,"unload",EU._unload);EU._tryPreloadAttach();})();}YAHOO.util.EventProvider=function(){};YAHOO.util.EventProvider.prototype={__yui_events:null,__yui_subscribers:null,subscribe:function(A,C,F,E){this.__yui_events=this.__yui_events||{};var D=this.__yui_events[A];if(D){D.subscribe(C,F,E);
}else{this.__yui_subscribers=this.__yui_subscribers||{};var B=this.__yui_subscribers;if(!B[A]){B[A]=[];}B[A].push({fn:C,obj:F,overrideContext:E});}},unsubscribe:function(C,E,G){this.__yui_events=this.__yui_events||{};var A=this.__yui_events;if(C){var F=A[C];if(F){return F.unsubscribe(E,G);}}else{var B=true;for(var D in A){if(YAHOO.lang.hasOwnProperty(A,D)){B=B&&A[D].unsubscribe(E,G);}}return B;}return false;},unsubscribeAll:function(A){return this.unsubscribe(A);},createEvent:function(G,D){this.__yui_events=this.__yui_events||{};var A=D||{};var I=this.__yui_events;if(I[G]){}else{var H=A.scope||this;var E=(A.silent);var B=new YAHOO.util.CustomEvent(G,H,E,YAHOO.util.CustomEvent.FLAT);I[G]=B;if(A.onSubscribeCallback){B.subscribeEvent.subscribe(A.onSubscribeCallback);}this.__yui_subscribers=this.__yui_subscribers||{};var F=this.__yui_subscribers[G];if(F){for(var C=0;C<F.length;++C){B.subscribe(F[C].fn,F[C].obj,F[C].overrideContext);}}}return I[G];},fireEvent:function(E,D,A,C){this.__yui_events=this.__yui_events||{};var G=this.__yui_events[E];if(!G){return null;}var B=[];for(var F=1;F<arguments.length;++F){B.push(arguments[F]);}return G.fire.apply(G,B);},hasEvent:function(A){if(this.__yui_events){if(this.__yui_events[A]){return true;}}return false;}};(function(){var A=YAHOO.util.Event,C=YAHOO.lang;YAHOO.util.KeyListener=function(D,I,E,F){if(!D){}else{if(!I){}else{if(!E){}}}if(!F){F=YAHOO.util.KeyListener.KEYDOWN;}var G=new YAHOO.util.CustomEvent("keyPressed");this.enabledEvent=new YAHOO.util.CustomEvent("enabled");this.disabledEvent=new YAHOO.util.CustomEvent("disabled");if(C.isString(D)){D=document.getElementById(D);}if(C.isFunction(E)){G.subscribe(E);}else{G.subscribe(E.fn,E.scope,E.correctScope);}function H(O,N){if(!I.shift){I.shift=false;}if(!I.alt){I.alt=false;}if(!I.ctrl){I.ctrl=false;}if(O.shiftKey==I.shift&&O.altKey==I.alt&&O.ctrlKey==I.ctrl){var J,M=I.keys,L;if(YAHOO.lang.isArray(M)){for(var K=0;K<M.length;K++){J=M[K];L=A.getCharCode(O);if(J==L){G.fire(L,O);break;}}}else{L=A.getCharCode(O);if(M==L){G.fire(L,O);}}}}this.enable=function(){if(!this.enabled){A.on(D,F,H);this.enabledEvent.fire(I);}this.enabled=true;};this.disable=function(){if(this.enabled){A.removeListener(D,F,H);this.disabledEvent.fire(I);}this.enabled=false;};this.toString=function(){return"KeyListener ["+I.keys+"] "+D.tagName+(D.id?"["+D.id+"]":"");};};var B=YAHOO.util.KeyListener;B.KEYDOWN="keydown";B.KEYUP="keyup";B.KEY={ALT:18,BACK_SPACE:8,CAPS_LOCK:20,CONTROL:17,DELETE:46,DOWN:40,END:35,ENTER:13,ESCAPE:27,HOME:36,LEFT:37,META:224,NUM_LOCK:144,PAGE_DOWN:34,PAGE_UP:33,PAUSE:19,PRINTSCREEN:44,RIGHT:39,SCROLL_LOCK:145,SHIFT:16,SPACE:32,TAB:9,UP:38};})();YAHOO.register("event",YAHOO.util.Event,{version:"2.7.0",build:"1799"});