PHP GD - Create a "flag"

Hi, i've just started using GD libraries. My purpose is to create something like a flag. So that i have a 600*600 px background image, and a 1*1 px image for each colour I need. Ok now let's say i want to colour a third of the background image. I can use this code: imagecopymerge($base, $img1, 0, 0, 0, 0, 200, 600, 85); It will simply make red first 200 px (on x axys) of the bg image. And this work. Now the problem is: how can i add another colour on pixels from 201 (201 right? not 200?) to 400? Thankyou -- -- AnotherNetFellow Email: anothernetfellow@gmail.com