Need help with making drop down boxes that lets me sort items on website.

My name is Dennis and my family runs a Rock and Mineral business. They’ve done it for over 25 years. They’re very well known in the rock and mineral community and they’ve done most of their business on eBay. However, eBay charges a minimum of 10% of their money that they make everytime they sell something. I think we figured out that they took about $15,000 in eBay fees. They had a website before but it was hard to keep up to date because they were too busy. This is where I come in. I’m now in charge of their website. ([URL=”http://www.teresarocks.com”]www.teresarocks.com[/URL]). Check it out if you want ? Each gallery has 10 listings in it and so far, I have 9 galleries, with more to come in the next few weeks. I have a basic understanding of HTML and I’m pretty decent at using a WYSIWYG tool to get done what I need to get done. However, I see on many websites that people have a little dropdown box right at the top of their items where they can sort by price from highest to lowest or vice versa and they can also sort by type, etc….. what I want to know is where do I begin researching on what to do? What is that called? All of my knowledge on web developing has been self taught. So if anybody can help me on where to start, i’d highly appreciate it ? Thanks

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