// para o todos
	function mostraLayer( whichLayer )
	{
	  var elem, vis;
	  if( document.getElementById ) // this is the way the standards work
	    elem = document.getElementById( whichLayer );
	  else if( document.all ) // this is the way old msie versions work
	      elem = document.all[whichLayer];
	  else if( document.layers ) // this is the way nn4 works
	    elem = document.layers[whichLayer];
	  vis = elem.style;
	  // if the style.display value is blank we try to figure it out here
	  if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)
	    vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';
	  vis.display = (vis.display==''||vis.display=='block')?'none':'block';
	}

// para o compartilhe
	function mostra_esconde(prima, segun, op){
	var elem, sumi,vis,invis;
	if( document.getElementById ){
			elem = document.getElementById(prima);
			sumi = document.getElementById(segun);
			} 
			else if( document.all ){
			elem = document.all[prima];
			sumi = document.all[segun];
			}
			else if( document.layers ) {
				elem = document.layers[prima];
				sumi= document.layers[segun];			
				}
	vis = elem.style;
	invis = sumi.style;
	if(op==1){
		if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)
		  vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';
		vis.display = (vis.display==''||vis.display=='block')?'none':'block';
		if(invis.display==''&&sumi.offsetWidth!=undefined&&sumi.offsetHeight!=undefined)
		  invis.display = (sumi.offsetWidth!=0&&sumi.offsetHeight!=0)?'block':'none';
		invis.display = (invis.display==''||vis.display=='block')?'none':'block';
		}
	else{
		vis.display='none';
		invis.display='none';
		}
	}

// para qualquer onmouseover
	function troca(nome,nova){
	document[nome].src=nova;
	}