var str_iFrameDoc = (document.all)?"document.frames(\"Composition\").document\;":"document.getElementById(\"Composition\").contentDocument\;";

function switchImage(mnuName, imgMnuSrc) 
{
  if (document.images)
  {
    if (imgMnuSrc != "none")
    {
      document.images[mnuName].src = imgMnuSrc;
    }
  }
}