<script language="javascript" type="text/javascript">
function openWin(fName, height, width) {
popup = window.open(fName,"popup","height=" + height + ",width=" + width + ",resizable=0,menubar=0,toolbar=0,location=0,directories=0,scrollbars=1,status=0")
}
</script>
<input type="button" value="Open" onmouseover="javascript:openWin('your_cfm_page.cfm',400,400);"/>