limit contral

Hi, all I'm quite new to php and still finding my way round and came across a problem. I'm making a script that pulls property (house) from a mysql database in categories e.g. there cat1, cat2 ect and in each category I only want to show 10 properties a time then click next to show the next 10 properties in that catorgy. here is the main part of the script http://www.smoothdesign.com/green/ if anyone can help that would be great. James james@smoothdesign.com