I'm not sure if the question is about calling an ADDITIONAL page or an ALTERNATIVE page.
For the former I'd include this in the <body> markup ...
<body onLoad="var DRAVE_ext=window.open('newpage.htm','drave','width=385,height=240');
DRAVE_ext.opener=window;
DRAVE_ext.focus();">
For the latter I use this structure (note carefully where the quote marks are, the zero is the time delay).
<html><head>
<meta http-equiv="Refresh" content="0; url=newpage.htm">
</head></html>