function getDataServer(url, vars){
     var xml = null;
     try{
         xml = new ActiveXObject("Microsoft.XMLHTTP");
     }catch(expeption){
         xml = new XMLHttpRequest();
     }
     xml.open("GET",url + vars, false);
     xml.send(null);
     if(xml.status == 404) alert("Url no valida");
     return xml.responseText;
}

function verProducto(id){
    var result = getDataServer("verProducto.php","?id="+id);
    if(result){
        //alert(result);
        window.document.getElementById("producto").innerHTML = result;
    }
}