function open_pop(imgName) {

    var w = 320,

        h = 200,

        x = Math.floor((screen.width  - w) / 2),

        y = Math.floor((screen.height - h) / 2),

        wnd;



    wnd =

     window.open

      (

       "../media_pop.aspx?imgName=" + escape(imgName),

      "_blank",

       "width=" + w + ",height=" + h + "," +

       "left=" + x + ",screenX=" + x + ",top=" + y + ",screenY=" + y + "," +

       "menubar=no,location=no,toolbar=no,status=no,dependant=yes"

      );



    if (wnd)

     if (!wnd.closed)

       wnd.focus();



  }