Marketpress and SSL

I am having trouble getting all my images and logo's to be secure in my site (www.platinumcarwash.com). I have spoken to my SSL provider and they say that my src="http://www.platinumcarwash.com/imagename.jpg" is the problem. They say change that to "https://" or to a virtual directory. I cannot seem to change any "src" in word press as the GUI interface does all the work. Can this be done with WordPress? Is there any other solution people have used out there for this problem?