Problems customizing the loading screen

I have tried using the documentation on this as well as following several board postings but cannot get the unity player to accept my custom loading logo.

To be specific, it does work in IE, but not firefox and chrome. Background colors change just fine, but logo will not and I've tried relative and absolute paths to the img.

Here is my embed code:

 function GetUnity() {
         if (typeof unityObject != "undefined") {
             return unityObject.getObjectById("unityPlayer");
         }
         return null;
     }
     if (typeof unityObject != "undefined") {
         
         var params = {
             backgroundcolor: "4e0001",
             bordercolor: "ffffff",
             textcolor: "FFFFFF",
             logoimage: "img/loadinglogo.png",
             progressbarimage: "/img/prog-bar.jpg",
             progressframeimage: "../img/prog-bar.jpg"
         };
         
     
         unityObject.embedUnity("unityPlayer", "slots/<?php echo($unityPlayerName) . $initString ?>", 760, 570, params);//);
     }