function KeyDownHandler(vName)
    {
        //var vName='UcLeftmenuListbar1_UcTimkiem1_btnLogin';
        var btn=document.getElementById(vName);
        // process only the Enter key
        //alert(event.keyCode);
        if (event.keyCode == 13)
        {
            // cancel the default submit
            event.returnValue=false;
            event.cancel = true;
            // submit the form by programmatically clicking the specified button    
            
            if (btn!=null) btn.click();
        }
    }