Javascript running on another page

I'm fiddling around with the fopen function, using it on urls. I now need to know how to run a JavaScript on another page by using PHP. I know I'll be able to do it from the url if only there's a way to run JavaScript from the url (just by using an fopen). Is there a way to run a JavaScript function from a url, or from PHP? For example: Would I be able to type something like: http://www.someurl.com/filename/javascript:javascriptname?parameterlist=valuelist& or is there a way PHP can do this?? Thanks. Liam