Append a small icon to mailto, PDF, doc, xls, & ppt links.

This is based off of b10m's Link Warning script and utilizing the free icons from famfamfam.

updated 10.01.2006. case insensitive matching. improved styling. email icon not placed when link text is email address or says email.

updated 10.17.2006. icon not placed if img is inside the link.

note 11.28.2006. I likely won't be updating this script again. I'm now using the firefox extension Link Alert to accomplish the same feat. I suggest you check it out. (And of course, play with my code all you like)