disable double Click on Web Page

Some time we face a problem like when we click on the server side button twice or more time ,it call a button event more then one time for single calling .some time it makes problem in our logic .so we need a solution code which hold the page till the server respond the single request .
Here i am placing a code which is useful in this case.

script type="text/javascript">
function pageLoad(sender, args) {
var rm = Sys.WebForms.PageRequestManager.getInstance();
rm.add_initializeRequest(initializeRequest);
rm.add_endRequest(endRequest);
}
function initializeRequest(sender, args) {
//Disable button to prevent double submit
var btn = $get(args._postBackElement.id);
if (btn) {
btn.disabled = true;
if (btn.className == 'button')
btn.className = 'buttonDisabled';
}
}
function endRequest(sender, args) {
//Re-enable button

var btn = $get(sender._postBackSettings.sourceElement.id);
if (btn) {
btn.disabled = false;
if (btn.className == 'buttonDisabled')
btn.className = 'button';
}
}
/script>

Source: http://itneeds4u.blogspot.com/