try{xmlhttp=new XMLHttpRequest();}catch(ee){try{xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");}catch(e){try{xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");}catch(E){xmlhttp=false;}}}

function limpa(){
	base=document.getElementById("portifolio").getElementsByTagName("a");
	for(i=0;i<=base.length;i++){
		if(document.getElementById("denver"+[i])){
			document.getElementById("denver"+[i]).style.display="none";
		};
	}
}

function mostre(obj){
	limpa();
	document.getElementById(obj.id.replace("cat","")).style.display="block";
}