[Costin Trifan]

At first this could be an easy task (hell, it really is) but not without a little trick. As you know, IE suports the fullscreen mode but other browsers don't, so in my example I'll show you how to make a crossbrowser popup window to be shown in fullscreen mode:

First, let's create the function that we'll use to open the popup window:

function openPopup(url, name, features) { return window.open(url, name, features); }

Now, let's get the available screen size:

var width = screen.width, height = screen.height;

Running the code:

openPopup("http://www.www.www", "windowName", 'width='+width+', height='+height +'toolbar=yes, scrollbars=yes');

Just a small note in the end: don't use popup windows excessivelly, use them only if you have something important to show.