need help with image and gd

[netzoner]

hi

i have downloaded Gmail Signature Generator and i have a problem in the name length it only accept 19 character and the rest will go outside the border
like this example

http://www.imagehosting.us/imagehosting/showimg.png/?id=534779

some one told me that with the gd library you can split the image and write what ever you want no matter what is the number of the characters and after that the script will join the image and show it to the user to save

something like this

http://www.imagehosting.us/imagehosting/showing.jpg/?id=534778

I know nothing in php your help in this matter is highly appreciated