you don't need any html skills. jus download a webserver and run it on ur computer, and when you get a spam message reply to it with a link to ur computer (http://whateveryouripis). if they click on it the server will have logged their IP. but you really can't do anything about the spam though. If somebody sends you a message saying "hey sexy!!" are you gonna sue them for sexual assult. It's a chat program and people use it to chat, and if somebody decides to write a text message with a link to it you really can't do nothing about that. Now, the leeto-buritto thing to do would be to hack the website they are promoting an deface it with something like "Stop with the Spam" or some shit.
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