Open PopUp Window Maximized

Hello Experts. I have thumbnails on a web page that, when clicked, opens a popup window displaying a jpg. I want the popup browser to open maximized, since all the images are different sizes. I'm using the code below, but it's not working. Please advise. Many kind thanks in advance!

function winPopUp(URL) {
day = new Date();
id = day.getTime();
eval("page" + id + " =, '" + id + "', 'addressbar=0,toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1,screenX=0,screenY=0,top=0,left=0,maximize=1');");

<a href="javascript:winPopUp('images/photo1.jpg')">Link</a>
John AccountAsked:
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This is a simple example I found that I use,it uses the availWidth and availHeight

if (window.screen) {
w = window.screen.availWidth;
h = window.screen.availHeight;

<script LANGUAGE="JavaScript">function winPopUp(URL) {
 day = new Date();
 id = day.getTime();
 str=str+'height='+screen.height+', width='+screen.width
 eval('page' + id+', id,str )')
<a href="javascript:winPopUp('')">

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John AccountAuthor Commented:
Thank you, GwynforWeb. Perfect!
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