function boxPopupar(cat){
var cont;
cont = document.getElementById('all-box-populares');
        
ajax=aboft(); 
ajax.open("GET", 'ajax/artistas-popuplares.php?cat='+cat,true); 
ajax.setRequestHeader("Cache-Control", "no-cache");
ajax.setRequestHeader("Pragma", "no-cache");
ajax.setRequestHeader("Charset", "ISO-8859-1");

var objBody = cont;
var objOverlay = document.createElement("div");
objOverlay.setAttribute('id','preloaderboxpopular');
objBody.appendChild(objOverlay);

document.getElementById('preloaderboxpopular').innerHTML = 'Carregando...';	

ajax.onreadystatechange=function(){
if(ajax.readyState==1){	
}else if(ajax.readyState==4){
if(ajax.status==200){
cont.innerHTML = ajax.responseText; 
}else if(ajax.status==404){
cont.innerHTML = "Página não encontrada";
}else{
cont.innerHTML = "Error:".ajax.status; 
}}}
ajax.send(null);
}