Ok, I created a custom bbcode and I used it to edit your post take a look here:

http://http://setiusa.free-dc.org/vbforum/showthread.php?193-Welcome-New-Members-for-November-2010!&p=743&viewfull=1#post743

The bbcode is [wht] for white space you just include that block around the line which you want to have space in and it should work. In the post above I used the tag 3 times