The links work, but not fine because of the undesirable pop-ups. (Yes I know you can block them but many are useful, for example, for filling in my time sheets)
This is an example of yours with surplus code
[IMG=http://img337.imageshack.us/img337/9256/img0921fy.jpg]http://[/img]If you must link to imageshack, which is more time-consuming to upload to than simple resizing and attaching, as you have to resize to use it anyway, just use the insert hyperlink button.