function calender2(){ 
        strleft = "dialogleft:" + eval(window.screenLeft + window.event.clientX ) ; 
        strtop = ";dialogtop:" + eval(window.screenTop + window.event.clientY ) ; 
        return window.showModalDialog("/include/lib/calendar.asp","", strleft +  strtop +";dialogWidth:190px; dialogHeight:220px;scroll:no;status:no;titlebar:no;center:no;help:yes;"); 
    } 
    function is_null(item_var) { 
        if(item_var == "" || item_var == null || item_var == 'undefined' || item_var == " ") 
        return true; 
     
        return false; 
    }