Change "Insert Image" button from auto-embed to [img]?

[slobra]

Hello,

I'm using 3.8.2 and when I click the "Insert Image" button and enter the URL to an image it automatically embeds the image in the post. I would prefer it to put this (without the spaces of course):

[ img ]http://example.com/image.jpg[ /img ]

I can't figure out how to change this. I'd like the "Insert Image" button to function the same as it does here on vbulletin.org. Thanks for any help!

Keith