Banner Generator Script

We need a script to be used on a website to generate banners based on templates in the most common sizes, similar to [login to view URL] or [login to view URL];pag=1&opt=2 The user must be able to select a banner size, write some lines of text, change it's font, color, background, border, add some effects like glitter or shadows. The script should then generate an image file with the user preferences applied to the banner.