Parameter question

I want to create a "double php web page"..what i mean is that it will work as a usual web page if you call it as wallpapers.php...but at the same time i want it to work as a way of getting info..i would like to that page get parameters like the date at which the page was saw but ONLY BY SOME PERSON...so my question is how do i create my page to see if the user wrote any parameter without getting errors?

i know the function to get parameters is the $_GET['var']...but how do i do the rest?

i might be able help you out, but i still dont understand what you want. explain more clearly please.

hmmm in another forum someone pointed me to use the isset() function to check if the var is whenever declared or not...tks anyways

no problem. :D