product page with options to filter products according prices, name etc

Hi!

1.
I have 5 product categories. Each category page has its products listed. I want cutomers to filter the category page according to prices, name, etc by using a menu list. Is it the SEARCH wizard I use to accomplish that? I have already a recordset rsProducts. I suppose I need to create new recordsets(Queries) for each option, right?
Are there possibilities using rsProducts and some javascripts so that the filtering can be done on the client side?

The menu list looks like:
<form method="post" action="">
<select name="filterProduct">
<option selected="selected" value="">filter products</option>
<option value="">by price</option>
<option value="">by weight</option>
<option value="">by color</option>
</select>
</from>

There is no button to start filtering. As soon as the customer selects an option, filtering should start immediately. Do I need javascript for that without button?
I am thinking the way to do it could be placing some dynamic data in the value attribute of options, where the values includes sessionID and other filter parameters.
But I really do not know how to do it? Could you guys walk me through this?

I also want to use the same functionality in the results page, to filter the search results. Searching within the searched results using the above menu list.