function OpenWindow(pageURL, width, height)
{
    window.open(pageURL, "mywin","left=20, top=20, width=" + width + ", height=" + height + ", toolbar=0, resizable=0, location=0, directories=0, menubar=0, status=0");
    //return false;
}

// close any open validator callout extenders
function closeExistingCallout()
{
    if (AjaxControlToolkit.ValidatorCalloutBehavior._currentCallout != null)
    {
        AjaxControlToolkit.ValidatorCalloutBehavior._currentCallout.hide();
    }    
}