function roundedConer(){
    settings = {
       tl: { radius: 5 },
         tr: { radius: 5 },
         bl: { radius: 5 },
         br: { radius: 5 },
         antiAlias: true,
         autoPad: true,
         validTags: ["div", "p"]
     }
   var myBoxObject = new curvyCorners(settings, "presetExternalFiles");
   myBoxObject.applyCornersToAll();
 }

Event.observe(window, 'load', roundedConer);