AHHHH I Urgently need a Spell Check script... Please Help!

I'm looking for a spell check script to add to a website thats similar to spellcheck dot net. The script needs to allow me to offer a spell checking service where users just type or paste their text into a textbox and click submit for a pop-up box to appear which allows them to correct any spelling errors. Ideally, the script will look very similar to the WYSIWYG editor here on the warrior forum except it will only have one button to check spelling.

I'd prefer it if the script was in strong PHP and well established. I have seen a spell check script written in JQuery (jquery-spellchecker - jQuery Javascript PHP Spell Checker - Google Project Hosting) However, as good and light as this script is, it doesn't suit my needs because it takes the spelling errors out of context by placing them below the text area. As I said, I need a script that creates a pop-up box where the user can edit their errors within the main text body.

I hope I've explained myself properly.
Don't get me wrong, I would be happy to use a JavaScript or JQuery script if it suits my needs and doesn't require too much editing. I'll even consider using the Wordpress platform if a decent enough plugin is out there to do what I want.

Any suggestions?