checkTwoDate

function checkTwoDate(date1,date2)
{
debugger;
       if(date1.value!="" && date2.value!="")
       {
            var d1 = new Date(date1.value);
            var d2 = new Date(date2.value);
            if(Date.parse(d1) - Date.parse(d2)>0)
            {
                alert("please select end_time later than begin_time !");
                date2.value="";
                date2.focus();
            }
       }
}