Topic awaiting preservation: Center popup

I am trying to have popup from a link be centered I am using this to call the popup page:

<a class="dark" href="#dummy" onclick="window.open('clients/chaotic.html','winscript','height=250,width=300,left=GetCenterLeft(left),top=GetCenterTop(top),toolbars=0'); return false">Chaotic Entertainment</a>

and I was hoping to try and make something like this work to calculate the center coordinates

function GetCenterLeft(num) {
// compute center coordinate
if(NN4&#0124; &#0124;NN6) {
num=Math.round((window.innerWidth/2)-(w/2))
} else {
num=Math.round((document.body.clientWidth/2)-(w/2))
}
}

function GetCenterTop(num) {
// compute center coordinate
if(NN4&#0124; &#0124;NN6) {

num=Math.round((window.innerHeight/2)-(h/2))
} else {
num=Math.round((document.body.clientHeight/2)-(h/2))
}
}

I'm no javascript guru so am I even close or is there an easier way to do this? I haven't currently got this posted online but I can if it helps.

I guess you should have something like

return num;

at the end of both functions. Otherwise they calculate the positions without returning the calculated value.

kuckus (cell #282)

I copied this from my site:

<a class="dark" href="#dummy" onclick="go('clients/chaotic.html',300,250); return false;">Chaotic Entertainment</a>

function go(url,tWidth,tHeight) {
gleft = (screen.width-tWidth)/2;
gtop = (screen.height-tHeight)/2;
popup = open(url,"gWindow",'toolbar=0,location=0,directories=0,status=1,menubar=0,scrollbars=1,resizable=1,width='+tWidth+',height='+tHeight+',left='+gleft+',top='+gtop+'');
}

That should help, unless you want the popup to be centered according to the browser window instead of the screen, then replace screen.width with the window.innerWidth .. what you have below (screen.width, is IE&NS4 compatable).