Hi! im creating a website....index.php must handle all the pages?

[ice41]

Hi! im creating a website....index.php must handle all the pages, like ?view=subindex.php and such to display the pages without changing to css or main GUI..my problem is how do i show it when it is clicked?and where to i put the page to be called in the index.php file, or should i use a <div> or inlcude ' file.php'?please help me!thanks...