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Try:
<script language="JavaScript"><!--
var w = 480, h = 340;
if (document.all || document.layers) {
w = screen.availWidth;
h = screen.availHeight;
}
var popW = 300, popH = 200;
var leftPos = (w-popW)/2, topPos = (h-popH)/2;
window.open('page,html','popup','width=' + popW + ',height=' + popH + ',top=' + topPos + ',left=' + leftPos);
//--></script>If you want to center the popup in the browser window use this instead of screen.availWidth and screen.availHeight:
<script language="JavaScript"><!--
var w = 480, h = 340;
if (document.all) {
/* the following is only available after onLoad */
w = document.body.clientWidth;
h = document.body.clientHeight;
}
else if (document.layers) {
w = window.innerWidth;
h = window.innerHeight;
}
var popW = 300, popH = 200;
var leftPos = (w-popW)/2, topPos = (h-popH)/2;
window.open('page,html','popup','width=' + popW + ',height='+popH+',top='+topPos+','left='+leftPos);
//--></script>