Snooping info on visitors' browser and settings

Hi, I wonder if there is any smart way gathering info like screen color depth and resolution with PHP? I suppose there aren't any core functions for that in PHP, but I was thinking about some sort of a mixture of JavaScript and PHP. More specifically, the problem would be how to transmit the data JavaScript has collected to PHP. I think that cookies or GET could do this, but this isn't the best way in this case because the users that come to the page I'm building, don't usually get any deeper to the site than the front page. Therefore there would be no way to actually save the data gathered by Javascript. In my case, would some sort of 'blank' self-refreshing page before entering the main site be the only solution or can anyone of you gurus make anything better up? The idea of having one extra page opening every time a user enters the site doesn't sound too inviting ;) cheers, Markus ---- PS. If replying directly to me, please remove the EISPÄMMIÄ part from the email address.