Post installation

I'm not able to have the image.module working properly.
I copy the package files in the \modules directory according to the install instructions, then I go to the Adminster -> Modules page and enable the image module (not the image_attach and image_gallery yet) and submit the change. Now, when I go to the Adminster -> Settings-> Image page I see at the top the following error message (in red)

Make sure you have a working image toolkit installed and enabled, for more information see: the settings page

Has drupal got any means of changing the urls in the browser – I’m developing some AJAX content pages using jquery but having the annoying problem of the url not matching the content on some ocasions (might i need to use php to change the headers ???)

I just want the url to default back to the main page for all AJAX content

I next need to maybe sort of bookmarking but i think this can be done using javascript

I intalled TinyMCE, created a profile, set the roles to all, and chose the profile option to display a link to enable and disable rich text editing.

However, the link never shows up under the TinyMCE window. How come? No matter what role I log in as, it never shows up. Any ideas? I'm desperate!

I can't for the life of me figure out how to allow users to select a different theme from the default.

i've got three themes I've configured for use on my site. One doesn't work well with IE6 and Gallery2 embedded, but it's my favorite theme (Friendselectric). How can I allow users to change the default theme in their profile?

I tried the ecommerce package but there are so many things in it that I don't need and so many that I do need that it doesn't have. I need a module that supports:
Subscriptions
Purchasing single items, no cart is necessary
Order Histories

I know the LM Paypal one does most of those things. Is it possible to have a button to purchase a single item, not a subscription, that will show up on the LM order history?

Just curious if its worth looking into: http://eaccelerator.net/

Would like to hear your feedback if it improved your drupal load speed or not. :)