I have some code, how do I turn it into a widget?

Hello,
I recently got a shoutbox for my blog and am having a small problem. It’s not in the appearance/plugins page. So, I have a bit of code to enable it in sidebar.php but I would rather it be a widget so if another admin wishes to move some widgets around, they can without manipulating the code. So how do I do this? (I prefer not getting another plugin to do this!)

Here is the code
<?php if(function_exists(jal_get_shoutbox)) { jal_get_shoutbox(); } ?>