var popupWin = '';              
function changeWindow(url) {
          if (popupWin != null && !popupWin.closed && popupWin.location) {
                popupWin.close();
          }
          popupWin = window.open(url,'remote','width=750,height=400,toolbar=no,menubar=no,resizable=yes,scrollbars=yes,status=yes,location=yes,screenX=10,screenY=10,top=10,left=10,alwaysRaised=yes,z-lock=yes');
      //popupWin.focus();
}
 
 
 
 
function randomImage(){
var img = new Array();
var img_path = "/images/";
var img_name = "right_3";
var img_ext = ".gif";
var img_id = document.getElementById("image_id");
for(var a= 0; a < 8; a++){
img[a] = img_path + img_name + a + img_ext;
}
var i = Math.floor (Math.random() * a);
img_id.src = img[i];
}