function showEvi(div){ 
	var riquadro = document.getElementById(div); 
	if(riquadro.style.display == "block"){ 
	riquadro.style.display = "none"; } 
	else { 
	riquadro.style.display = "block"; } 
	} 
	
function hide(div){
	var elem = document.getElementById(div);
	elem.style.display = "none";
	}

function show(div){    
	var elem = document.getElementById(div);
	elem.style.display = "block";
	} 

function iframeDocument(iframe)
{
  if(iframe.contentDocument) 
    doc = iframe.contentDocument;  // Firefox, Opera 
  else if(iframe.contentWindow)
    doc = iframe.contentWindow.document; // Internet Explorer
  else if(iframe.document) 
    doc = iframe.document; // Others? 
  return doc;
}