Call asynchronosuly two functions

Question

Hi,

This a php script.I need to download a file using php code.

The zip file can be accessed via a http path.The size is around 400 mb+.Currently i use copy command to save the file(this file lies in another server which is accessed through eg- http://sample.com/myzip.zip) which to local machine.But since its a large file the browser timeouts causing the page to output a blank page after 4-5 minutes.

Can i over come this with jquery using async?

Or can i do parallel processing using php.Please help?

If so could you guide me with a demo please?

Thanks in adv and waiting for the replyy.:)