function closemainwarn(set_user_id)
{
var tmp = document.getElementById('mainwarn');
if(tmp)
{
tmp.style.display = 'none';
tmp.style.visibility = "hidden";
}
var clt = new XMLHttpRequest();
var target_location = "/system/closewarn.php?set_user_id=" + set_user_id;
//alert(target_location);
clt.open("GET", target_location);
clt.send(clt);
clt=null;
}