Play youtube videoes from asp.net website

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ASP.NET

I want to play a youtube video from my website by selecting the video from a list of videos in a listbox.
the code below plays the video specified, but I want it to be dynamic, that is to play the video when selected from a listbox.
Please help:

<pre lang="cs"><script>
     google.load("swfobject", "2.1");

     function updateHTML(elmId, value) {
         document.getElementById(elmId).innerHTML = value;
     }

     // Loads the selected video into the player.
     function loadVideo() {
         var selectBox = document.getElementById("videoSelection");
         var videoID = selectBox.options[selectBox.selectedIndex].value

         if (ytplayer) {
             ytplayer.cueVideoById(videoID);

         }
     }

     // This function is called when an error is thrown by the player
     function onPlayerError(errorCode) {
         alert("An error occured of type:" + errorCode);
     }

     var target = "";

     // This function is automatically called by the player once it loads
     function onYouTubePlayerReady(playerId) {

         ytplayer = document.getElementById("ytPlayer");
         ytplayer.addEventListener("onError", "onPlayerError");
         ytplayer.addEventListener("onStateChange", "onPlayStateChange");

         target = document.forms[0].target;

     }



     //unstarted (-1), ended (0), playing (1), paused (2), buffering (3), video cued (5)
     var n = 0;
     function onPlayStateChange(newState) {

         if (newState == 1) {

             document.forms[0].elements["Send"].value = "1";
             document.forms[0].target = "SendFrame";
             document.forms[0].submit();
             updateHTML("counter", ++n);
         }
         else {
             document.forms[0].elements["Send"].value = "0";
             document.forms[0].target = target;
         }
     }

     // The "main method" . Called when someone clicks "Run". ylLzyHk54Z0
     function loadPlayer() {
         // The video to load
         var videoID = "https://www.youtube.com/v/vGR5h2sqrXw"

         // Lets Flash from another domain call JavaScript
         var params = { allowScriptAccess: "always" };
         // The element id of the Flash embed
         var atts = { id: "ytPlayer" };
         // All of the magic handled by SWFObject (http://code.google.com/p/swfobject/)
         swfobject.embedSWF(videoID + "&enablejsapi=1&playerapiid=player1", "videoDiv", "480", "295", "8", null, null, params, atts);
     }
     function _run() {
         loadPlayer();
     }
     google.setOnLoadCallback(_run);
</script>

<form id="form1"  runat="server">
    <div>
    <div id="videoDiv">Load...</div>   
<div id="counter">0
<br />
    <asp:ListBox ID="ListBox1" runat="server">
    <asp:ListItem Text="Video one" Value="http://www.youtube.com/v/ylLzyHk54Z0"></asp:ListItem>
     <asp:ListItem Text="Video two" Value="https://www.youtube.com/v/vGR5h2sqrXw"></asp:ListItem>
      <asp:ListItem Text="Video three" Value="https://www.youtube.com/v/4xfTsO21RiM"></asp:ListItem>
    <asp:ListItem></asp:ListItem>
    </asp:ListBox>
</div> 
    </div>
    </form>