function finddaysadv(name,name2,name3){
var strDate1 = window.opener.document.getElementById(name).value;
var strDate2 = window.opener.document.getElementById(name2).value;
datDate1 = Date.parse(strDate1);
datDate2 = Date.parse(strDate2);
var datediff = ((datDate1-datDate2)/(24*60*60*1000));
if(isNaN(datediff)){datediff = 0;}
window.opener.document.getElementById(name3).value=datediff;
return true;
}