function swap(s,n){
  var el;
  if( n && document.images && document.images[n] )
   el = document.images[n];
  else if( event.srcElement && event.srcElement.src )
   el = event.srcElement;
  if( el )
   el.src = s;
}

// function for refer a friend popup page
function popUp(URL) {

day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=1,location=0,statusbar=1,menubar=0,resizable=1,width=443, height=333,left = 450,top = 180');");
//alert("it works!!");
}