How to determine the position of cursor in Text Area?

I have to solve next problem.
I need to create special editor for my application.
Page consist of two regions. First one is Text Area. Second one is Toolbar.
User input Text in Text Area. He can use toolbar for inputing additional text in the cursor position.
It should look like in this forum. When I press on "B", tag <b> inserts in my text, in the cursor position.
Regards, Kostya

If the functionality you need is already implemented in this forum software, just pick it up from there!
Look at the HTML Source of the Post Message page and you will see that the Bold, Italic and Underline buttons call a Javascript function called
onclick="styleTag('b',document.postform.body);return false;All the Javascript functions are in http://forums.oracle.com/forums/utils.js
Thanks

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