function close_auth() {
document.getElementById('auth_form').style.display = "none";
document.getElementById('top_banner').style.display = "";
}

function show_auth (obj) {
var left=document.getElementById('auth_tbl').offsetLeft;
document.getElementById('top_banner').style.display = "none";
document.getElementById('auth_form').style.top = 4;
document.getElementById('auth_form').style.left = 240;
document.getElementById('auth_form').style.display = "";
}