function time_arrived() {
    enter=new Date();
 }
 function time_here() {
    exit=new Date();
    time=(exit.getTime()-enter.getTime())/1000;
    time=Math.round(time);
    alert (" <::{  " + time + " Second  }::> ")
 }
 document.write("<br><font style='font-family: Tahoma; font-size: 11;'>");
document.write("<a target=_blank href='http://www.irlearning.com'style='text-decoration: none'>&nbsp;منبع جاوااسكريپت&nbsp;</a>");
document.write("</font>")