Hi there,
I'm intimately familiar with PHP and understand the language deeply. I'm also familiar with the various PHP graphic libraries like gd, gd2, imagemagik which are required for generating / cropping / resizing images, which your script is likely interacting with.
In addition to PHP, I'm also very familiar with Javascript, and if your website has any Ajax features, they wouldn't be a problem for me either.
Please give me some further details about your project, such as what changes you're looking for, so I can give you a firm deadline estimate.
Looking forward to hearing from you,
Ali.