Copy Remote File to Local Server

I am writing a script that will read a file from a remote server and write it to the local server. It works fine except when large files are attempted. It times out and gives the error that the maximum execution time has been reached and the file will only be partially copied to the local server. Is there a way around something like this? Or perhaps could the script keep time of how long it has been running will reading/writing and then be able to continue writing to the partial file? Does anyone have any suggestions for this problem? Thanks, Matt Palermo http://sweetphp.com