//-- IFRAME

 function fnIframeLoaded(){
  var iframe=document.getElementById('idIframe');
  if (iframe.contentDocument) { // For NS6
    iframeDocument = iframe.contentDocument; 
  } else if (iframe.contentWindow) { // For IE5.5 and IE6
    iframeDocument = iframe.contentWindow.document;
  } else if (iframe.document) { // For IE5
    iframeDocument = iframe.document;
  } else { // We got nothin.
    alert("Error: could not find IFRAME document");
  }
  document.getElementById('idMiddle').innerHTML=iframeDocument.body.innerHTML +'<br/><br/>';
 }

//-- ROLL IN/OUT

 function fnRollIn(button, file){
  document.getElementById(button).src="images/r_"+ file;
 }

 function fnRollOut(button, file){
  document.getElementById(button).src="images/"+ file;
 }