if ((BrowserDetect.version == 6) && (BrowserDetect.browser == "Explorer")) {
 //this dies in IE6 apparently
 //TODO: fix this
}else{
  
  Event.onReady(function() {
    if ($('modal_window')) {
      $("modal_window").setStyle({"display": "none"});
      
      Control.Modal.open($('modal_window'),{
        fade: true,
        overlayOpacity: 0.75
      });
    }
  });
 
}