Annoying IMG tag issue

[modric]

Problem:
When I write [IMG]http....[/IMG]
so starting and closing tag are in the same row, all is O.K., image is shown.

But when:
[IMG]http.....
......[/IMG]
so closing tag is in the next row, image wont show.
Sometimes the link of image is so long that it doesn't fit in one row (e.g. when trying to put it in forum signature or in body of the post).
Is there any trick to overcome this?

[GLD]

Haven't come across this problem before... The only workaround I could think of would be to put the URL through something lke http://tinyurl.com/.