This is my first post so apologies in advance if my words come across as the ramblings of a complete newbie...that's because they are.

I have spent the last couple of days reading posts on this forum and I have learnt a lot but at the same time probably have more questions now than before I started reading...

Also my questions relate to php, urls and seo but all in the context of a directory I am having built - which is why I am posting here - sorry if this is the wrong place.

OK - so I am having a directory built by developers using PHP. My directory has a 3 level taxonomy - category, subcategory and classification. I want my directory to be primarily human friendly whilst being as SE friendly as possible.

For reasons I wont go into now I am using select menu (form items) which allow users to navigate through the categories and subcategories and classifications. I read yesterday how to make these javascript menus se friendly by using NOSCRIPT Markup. I will probably also have a text link to a page listing all my categories and classifications on my homepage SEs will be able to follow that.

Q1 - would you agree that having the text link and a list of static links for categories, subcategories and classifications is a good idea? (when my main navigation is javascript) or will the NOSCRIPT markup make that unnecessary?

When a user selects a category using the category select menu it submits using a javascript function and leads them to an url that is currently like:

http://www.example.co.uk/index.php?mode=category

it does not matter which option in the select menu that the user picks, the above url does not change (although the results obviously do)

I thought it would be better if the category was reflected in the URL and my developer told me that I could have

www.example.co.uk/index.php?categoryname or www.example.co.uk/?categoryname

What I would really like is to be able to have www.example.co.uk/categoryname and my research on here so far suggests that you do this by using Mod Rewrite so

Q2 - Is this correct? Is Mod rewrite the way to do it and can someone please point me to the best thread about how to go about doing this? and If I have a lot of categories/classifications does each one need to be rewritten individually or can it be done automatically? Also would I be rewriting to example.co.uk/categoryname.html or .php? or no ending at all

Now the above example is what happens when a user chooses a category (Level 1), but I also need to know the best way to deal with drilling down further. so...

Q3 - is it better to have:
www.example.co.uk/categoryname/subcategoryname/classname or
www.example.co.uk/classname
what are the pros and cons I should be considering here?

As all my directory pages are dynamically generated, I am also confused about how google and other search engines deal with this. The data on the page www.example.com/categoryname is dynamically generated and therefore the page is basically empty until the point that data is called so

Q4 - Does googlebot etc call dynamic data in the same way that a user would and therefore will the data in the database be accessible to google? What factors should I be considering bearing in mind I want to be as SE friendly as possible and I would like my categories and classifications and directory listings listed in google etc

Finally, I have some concerns about how I sync the values in my 3 select menus with their respective text links. so..

Q5 - if a user types in www.example.co.uk/categoryname how do I get this to have the same effect as choosing the categoryname from the select menu and when the page loads, can I get the select menu to display that category name in the menu automaticaly.

Phew. Sorry for the rant and if you have read this far you already have my gratitude.

[edited by: Webwork at 7:34 pm (utc) on July 30, 2008]
[edit reason] We use "Example.com" since no one can "own" Example.com [/edit]