mysql question

I have some images in my database, and they are put into certain categories. So what i have in my database is a table called images and a table called categories. My question is I want to retrieve images by selected categories the user chooses. So if there are a total of five categories, the user chooses two categories to views images, it will select those images only by the two categories the user selected. How can I do this with just submitting one query instead of submitting two queries? In both the image table and category table there is a unique id. So the image in the image table can reference the category in the category table. Ben D. __________________________________________________ Do you Yahoo!? Y! Web Hosting - Let the expert host your web site http://webhosting.yahoo.com/