Without being able to directly connect to each database ( username and password) and have database tables and fields, you are left with searching tha web pages manually.
For autotrader do a search and place that in your form with the data from your site
Code:
http://www.autotrader.com/fyc/searchresults.jsp?num_records=&search_lang=en&page_location=findacar%3A%3Aispsearchform&search_type=used&distance=0&address=&marketZipError=false&style_flag=1&make=&model=&make2=&start_year=&end_year=&min_price=&max_price=&transmission=&engine=&drive=&doors=&fuel=&max_mileage=&color=&keywords_display=&sort_type=priceDESC&body_code=0&certified=&advanced=&default_sort=priceDESC&awsp=false&keywordsrep=&keywordsfyc=
from there you can place your data in the above text line and use perl possible asp to get the web page. Once you write that file to a text file on your server or site, you can have perl or asp scan the code... Have it delete everything before the
Quote:
<!-- POSITIVE FYC RESULT -->
tag and there should be another tag ending it. the items left would be the card ads and pictures you want.