Safari Hijacked

Hello- My Safari and other internet browsers (Chrome...) were hijacked recently. I am assuming that this is due to visiting a crap site that attached a cookie to my computer, but anyways. Currently when I open safari, rather than it going directly to google.com or my bookmarks page, it opens to this "search marquis" search engine. I know from previous experience that this is a bogus page and that I shouldn't use it- so I typically just click on the URL area and type in google.com.... But, this is becoming increasingly annoying. I have already done everything I can think of to manage (REMOVE THIS THING) this, but no luck. I have cleaned out my cookies, changed the safari preferences ( even though it was still showing google), tried the Go> Go to folder> Library, and I even tried the basic 'restart your computer' stuff. Other than taking my computer into an Apple store and paying a load of money to have them look at it, does anyone have any other ideas on how to get rid of this stupid Hijacking????