Pass a variable to flash through html

Hey guys,
Quick question. I have this website that has several sections(Abouts Us, Projects, Services ect.) in it and I want it to automatically go to one of them(Services) if people enter the website through a url I am sending through a email campaign about Services. I know I can just attach a variable to the url but it seems I have to specify the .swf so that the url just loads that .swf and not the webpage. Is there any way around that?