function popUp(url,box_title){
        if (window.showModalDialog)
        {
            retVal = window.showModalDialog(url ,'Show Popup Window',"dialogHeight:540px,dialogWidth:600px,resizable:yes,scroll:no,edge:sunken,status:no");
        }
            // to handle in Firefox
        else
        {
            retVal = window.open(url,box_title,'modal=yes,menubar=no,scrollbars=no,HEIGHT=500,resizable=no,width=550,top=50,left=50');
            retVal.focus();
        }
    }