popunder windows is a new browser window that goes to the background rather than appear in the
foreground i.e. behind other windows rather than in front of all windows.
<script language="JavaScript">
<!--
var popunder="http://www.somedomain.com";
function loadpopunder() {
win2=window.open(popunder);
win2.blur();
window.focus();
}
loadpopunder();
-->
</script>