Welcome to the Q&A Forum

While not 100% effective you can tell Google to ignore the ?dealer parameter in Webmaster Tools but that would involve setting up the parameter differently so it looks like ?dealer=1234 rather than ?dealer1234, so not sure how big a pain that is. Otherwise you can set up a canonical tag so that the canonical version of the page is always /index.aspx for every parameter. Ideally do both if it will help you get the links in. You should lose very little of the link juice by ignoring the parameter and using canonical. EDIT: Here's a little bit on parameter handling - http://www.google.com/support/webmasters/bin/answer.py?answer=147959 - complete with clever Barenaked Ladies reference