File Handing Windows / Linux

Hiya! I am trying to make some code which gets a handle to a directory, but has different code for my localhost (Windows) and for online (Linux server). Basically, I want either of the below lines. Say if the first fails, it must be on Linux and then it uses the line below. The two example lines are: @ $handle = opendir("c:/websites/mywebsite/extra/photos/".$_GET['page']."/"); @ $handle = opendir("/home/mywebsite/public_html/extra/photos/".$_GET['page']."/"); Had a search on google, but not really sure what to look for! Love, Steve XxX