//Permite ver u ocultar un objeto
function ver(id, val){  
    if(val)
        document.getElementById(id).style.display = val;
    else{
        //alert(document.getElementById(id).style.display != "none");
        if(document.getElementById(id).style.display != "none"){
            document.getElementById(id).style.display = "none";
            document.getElementById(id).innerHTML = "";
            }
        else{
            document.getElementById(id).style.display = "block";
            }
    }
    document.getElementsByTagName("html")[0].style.overflow = "auto";
}