ASP.Net VB.Net URL Routing Question

I have mapped a page route called: routes.MapPageRoute("CustomerDetailsRoute", "CostList/{mmid}", "~/customerdetails.aspx") The page works perfectly, but: My images are on the "~/images" folder and on the browser the image URL shows "~/CostList/images". So images are not displayed on my web page. Could anybody help me showing how to correct this problem? ...