<script language="javascript">
    /* Code to fix multi-click issue */
 
    // handle the unload of the form
    window.attachEvent("onbeforeunload", disableWindowControlsOnUnload);
 
    // loop through relevant input controls and make sure the users do attempt a postback
    var elementCollection = document.getElementsByTagName("input");
    if ( elementCollection != null )
    {
        for ( var i = 0; i < elementCollection.length; i++ )
        {
            var element = elementCollection(i);
            if ( element.type == "submit" || element.type == "button" )
            {
                element.attachEvent("onclick", disableWindowControlsOnClick);
                element.attachEvent("ondblclick", handleDoubleClick);
            }
        }
    }
 
    // this method used to disable any input controls from firing
    function disableWindowControlsOnUnload()
    {
        document.body.style.cursor = "wait";
        for ( var j = 0; j < document.forms.length; j++ )
        {
            var elementCollection = document.forms(j).getElementsByTagName("input");            
            for ( var i = 0; i < elementCollection.length; i++ )
            {
                var element = elementCollection(i);
                if ( thisElement.type == "submit" || thisElement.type == "button" )
                    element.disabled = true;
            }
        }
 
        return true;
    }
 
    // this will make sure no events create a double post scenario
    var bubbleEvent = true;
    function disableWindowControlsOnClick()
    {
        if ( bubbleEvent == true )
        {
            document.body.style.cursor = "wait";
            showProcessingBanner();
            bubbleEvent = false;
        }
        else
        {
            window.event.cancelBubble = false;
            window.event.returnValue = false;
        }
    }
 
    function handleDoubleClick()
    {
            window.event.cancelBubble = false;
            window.event.returnValue = false;
    }
 
 
    function showProcessingBanner()
    {
        var bannerElement = "<div style='position:absolute; z-index:99; border-style:solid; background-color:white; width:400px; height:200px;'></div>";
        var banner = document.createElement(bannerElement);
 
        banner.innerHTML = "<span style='color:black; font-size:large; vertical-align:middle;'><center><br><br><br>Processing...</center></span>";
        banner.style.left = ( window.screen.availWidth / 2 ) - 200;
        banner.style.top  = ( window.screen.availHeight / 2 ) - 100;
        document.body.insertBefore(banner);
    }
 
    </script>