Forms and PHP

I have a question about forms and PHP. Here's what I'm looking to do. I'm trying to set up a spell checker that checks text entered in a form, but I want the check results to show up in a different window so that the user can change the misspelled words if they'd like. In other words, I want to be able to click a link and have another page open that checks the spelling. My question is how can I send the text from the form to this other page (which, right now, is a separate php script) so it can be spell checked without actually submitting the actual form first? In other words, I would like the user to be able to check the spelling without actually submitting the form. Thanks, Jason Giangrande