Where could i find a Script which only allows you onto a page if you are using 800x600 resolution...and otherwise tells you to alter your resolution, so that you can enter the page.
Just out of interest why on earth would you want to do that? I personally would not change my resolution to look at any website.
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I run at 1600x1200 and most people run above 800x600 nowadays and I won't for any website I visit, change my resolution. However if you're designing for an intranet then it may be a different thing.
I've got to agree with the others and I must say I'm curious as to why you want to do this. If you have a specific reason, great, its your site. However, I always run at a resolution above 800x600, and I would never change my resolution to view a site, no matter what the content is. Seems to me that you just be restricting your viewer base.
Also the majority of people just don't know HOW to change their resolution.
If you were talking about 800x600 and up, that's still bad. Say I'm at 640x480 and I can handle it. Well then I'm blocked...
Many games check if the user is running NT and quit if they are. Well now with Win2k and its gaming support that has proved to be a big problem.