progressbarimage flickering

Hello,

Does anyone have a clue why my progressbarimage flickers while it loads?

heres a link to it.

Thanks!

Edited:

Heres the code:

 function GetUnity() {
     if (typeof unityObject !== "undefined") {
         return unityObject.getObjectById("unityPlayer");
     }
     return null;
 }
 if (typeof unityObject !== "undefined") {
     var params = {
         backgroundcolor: "3e0000",
         bordercolor: "000000",
         textcolor: "c1b78a",
         logoimage: "unity/webplayer/logo.png",
         progressbarimage: "unity/webplayer/pb.png",
         progressframeimage: "unity/webplayer/pbf.png"
     };
     unityObject.embedUnity("unityPlayer", "unity/travessia.unity3d", 960, 600, params);
 }