function doPopups() {
  if (!document.getElementsByTagName) return false;
  var links=document.getElementsByTagName("a");
  for (var i=0; i < links.length; i++) {
    if (links[i].className.match("imgwin")) {
      links[i].onclick=function() {
      // Next two lines should be on one line
        window.open(this.href, "", "top=20,left=20,width=750,height=700,scrollbars=yes,resizable=yes");
        return false;
      }
    }
  }
}
window.onload=doPopups;
//top=20,left=20,width=750,height=700,scrollbars=yes