How to to ask for save changes if user is leving that page ?

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ASP.NET

Javascript

Hii,


I am using this script ..

function SaveOrCancel() {
           document.getElementById('<%=hdnBack.ClientID %>').value = "";

           if (confirm("If you leave this screen you may lose any unsaved data") == true) {
               document.getElementById('<%=hdnBack.ClientID %>').value = "SAVE";
               return true;
           }
           else {
               document.getElementById('<%=hdnBack.ClientID %>').value = "BACK";
               return true;
           }
       }

this was i was using only for back button .. now what i want to do is if user try to leave that page ,.,, say if he click some other link of my application .. or he press back of browser .. he should be worn to save the chganges ... how can i do that ...

if he click save of that warning box my call should send to save button which will perform all the necessary action if he click cancel he simply redirect to whrereve he want to redirect