Popup for SharePoint 2010 Lookups

Normally SharePoint 2010 Lookups open in a new tab.  So if you want to open it as a popup, it is really simple. Add fallowing script to your SharePoint page.

<script type="text/javascript">
var winIsDlg = 0;
(function () {
 var e, q = window.location.search.substring(1), r = /([^&=]+)=([^&]+)/g;
 while (e = r.exec(q))
    if(decodeURIComponent(e[1])=="IsDlg" && decodeURIComponent(e[2]) == "1")
    {winIsDlg=1;}
})();

$(document).ready(function(){
 if(winIsDlg==1)
 {
    $("td[id='SPFieldLookup'] a").each(
      function(){
       this.href="javascript:OpenPopUpPage('" + this.href + "')";
      });
 }
});
</script>