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How to open new window (popup) and center on screen

Here is a java script function that opens a new window (popup) and puts it on center of screen:

<script>
function PopupCenter(pageURL, title,w,h) {
var left = (screen.width/2)-(w/2);
var top = (screen.height/2)-(h/2);
var targetWin = window.open (pageURL, title, 'toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, copyhistory=no, width='+w+', height='+h+', top='+top+', left='+left);
}
</script>

The link example would be like this:
<a href="javascript:void(0);" onclick="PopupCenter('http://www.nigraphic.com', 'myPop1',400,400);">CLICK TO OPEN POPUP</a>
CLICK TO OPEN POPUP

This is a COPY and PASTE script, tested on internet explorer 7 / 6 and firefox 2.

Differentiating CSS for IE7 IE6 and firefox

if you put # before any css tag, only IE 7 and IE 6 will read that line.
if you put _ before any css tag, only IE 6 will read that line.

example: 

width: 560px;     /* All other browsers */ 
#width: 558px;    /* IE 6 & 7 */ 
_width: 557px;    /* IE 6 */

just remember to keep this order.

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