Building a webcrawler?

i hope this isn't difficult i just about finished my site, now i want to populate it.

I have an insert form with 4 fields(url, name, info, keywords).

i want a webcrawler to go around the web collecting and inserting into these 4 fields and submitting.

how would i go about this is it difficult?

whats the easiest language to do this in?

well for starters javascript probably wouldn't work (that is the forum you posted in). you would probably be best making an actual program (like c#,c++,basic) to manually surf the web. problem with using php is mostly its timing out. you could use php and any of the fopen/file_get_* functions to get pages and regular expressions/text searches to find whatever you want on a page and submit it.