html script

Hi, i need a programor script that will check current web page on any browser i run for specific words and put them in the log file. Example: the mozilla firefox with selenium ide plugin is executing a script, that takes mozilla from yahoo cars page to craiglist pages. Let's say, i need everything about mustang 67 model. If anywhere on webpage is a text "mustang" or "67" the script then saves this page, logs time of the event and address to log file and directory. that is it.