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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>