Drawing rectangle in a web page

Do you know how I could draw a rectangle on a web page as shown on the webpage below?

http://www.redalt.com/Tools/kubrickr...e6b5851e49%3A5

EDIT: The webpage won't load I guess.
Basically I want create a webpage that will let user to draw a rectangle on a webpage, just like what you do when you crop an image in an image editor. Javascript solution preferred

Code:

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<div style="height: 15px; width:15px; border: 1px solid black;">&nbsp;</div>

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Now you can use javascript to assign the actual values

Okay, that's easy. I haven't done javascript long enough to notice the obvious.

Thanks, my new moderator ROCKS!!

Please make sure to test it. It's been awhile since I've used the height tag.