function ObjAjax(){
try{return new XMLHttpRequest()}
catch(e){try{return new ActiveXObject("Msxml2.XMLHTTP")}
catch(e){return new ActiveXObject("Microsoft.XMLHTTP")}}
return null;
}

function navegar(page,pr){
 
ajax = new ObjAjax();
if(pr=="foto")
{
	 
var div = document.getElementById("foto_maior");
 
}
else if(pr=="cad")
{
var div = document.getElementById("tipo_cad");
}
else
{
	var div = document.getElementById("cont");
}
ajax.onreadystatechange = function(){
if(ajax.readyState == 1){div.innerHTML="<img src='imgs/loading.gif'/>";}
if(ajax.readyState == 4){div.innerHTML=ajax.responseText;}

}



ajax.open("GET",page,true);
ajax.send(null);
}