lightbox without rel tag or addRel without jquery

Question

yes this is 2 questions.

this is the idea. i want to put lightbox(or slimbox or mediabox or whateverbox) to my forum so that it will open user posted links in lightbox.

problem is, lightbox require rel=lightbox tag. and people are too lazy to use the custom bbcode that add the correct rel tag to the link.

so, can lightbox (or any other) work for all links without rel tag?

or, the alternative is to add rel tag to all links. i can use 'addRel' function from jquery. but it would be a waste to include the whole jquery only for this one.

how can i add rel tag without jquery?

tnx.

Answer 1

this question evolved into: http://stackoverflow.com/questions/1576283/help-with-getelementsbytagname-setattribute-and-regex-javascript :)