Lautaro, thanks! To round only the top corners, you can change the 5th parameter of the imagefilledrectangle that draws the “left to right” rectangle. In the script, this value is “$cy-$rad”, changing it to “$cy” does the trick. You could also comment out the imagefilledellipse commands that draw the lower corners, to lighten server load a slight bit. I’ve added some comments to the code to indicate the left-to-right and top-to-bottom rectangles, as well as each of the four corners.

Excellent script. I was looking for something like this to avoid using the jquery plugin.

Thanks for sharing!
Angel.