create one webpage, simple xhtml plus external style sheet

i have a website it has 5 pages, all of them are the same, they are created in php and html, i want you to change it so it uses just xhtml, its already has an external style sheet. it also uses a swf logo, so that needs to be displayed too. I also want to be able to display farsi text in my html pages so all you are doing is editing one webpage