Strech an image on any screen

hi, i am a newbie and got registered today (just now...) i need to know how to make an image strech able on any users screen... example i want to make the header streched first and the contents to be down on it... :/ hope to see a reply soon...

see this image, its a sample of it... or visit www.utorrent.com
http://i44.tinypic.com/t8nupy.jpg

thanks...

The background image of the header that goes across the screen (the one with the blue line at the bottom) is just a one pixel wide image (http://www.utorrent.com/images/header_background.png) that is repeated horizontally (through CSS). And the actual content of the header and the rest of the page is 956 pixels wide and centered horizontally.

Firebug (http://getfirebug.com/) helps investigating the source code of a page and finding out how they’ve done it.

hey, Firebug < addon really helped me... Thanks bro... :)