Not so full....

For example this code:

function CuteWebUI_AjaxUploader_OnMantleButton(btn,div)
 {
  div.onmouseover=function()
  {
   btn.style.color="#444444";
   document.body.style.cursor = "pointer"
   btn.style.textDecoration="underline";
  }
  div.onmouseout=function()
  {
   btn.style.color="";
   document.body.style.cursor = "pointer";
   btn.style.textDecoration="";
  }
  div.style.filter="";
  div.style.opacity="";
  div.style.mozOpacity="";
 }

Changes everything exept mouse cursor style :-(  I think you must predefine mouse style from flash or silverlight layer, pass some parameter there or somethingelse, but its really needed, maby you should make cursor style "pointer" value as default, when mouse is over that layer?