Unclosable windows

I went to a site earlier and there were some popus, I closed most of them but a few didn't have title bars and when i right-clicked on them in the taskbar no menu came up. How is this possible? Go here to see: http://tinyclock.tsx.org/

I had seen this on other sites as well. I only had one that didn't have a title bar and didn't have a close button in the window. that one froze IE and I had to restart. other than that I have had them without title bars but they all had a close button on the bottom of the window.

I would like to know how as well.

Code:

---

<script language="Javascript">
<!--
function click() {
if (event.button==2) {
alert('Click a link Go To A Page.  or... Press "Alt+F4" or close links to close window')
}

}document.onmousedown=click

// -->
</script>

---

simply browse that site with Opera, it doesn't let you hang in the air as the ie does ;)

i am gonna do some research. i have always wondered how that worked, but have never figured it out. I'll get back to this thread later. :)