You looking for javascript buddy.
<html>
<head>
<script language="JavaScript">
<!--
function open_window(url,name)
{
new_window = window.open('http://www.spechal.com','spechaldotcom', ' menubar,resizable,dependent,status,width=400,height=400,left=10,top=10')
}
// -->
</script>
</head>
<body onload="open_window()">
Your new window will open when this document loads
</body>
</html>