Javascript not working for Url Rewritten pages when using URL Rewrite in ASP.Net

I got a bug that my javascript is running fine untill I am not rewritting page url. When I rewrite page url it stop's working . For example

Javasript problem creating line url: "Demo.aspx/GetCustomers",  

It fails to detect page url  when I rewrite page name (Demo.aspx to trial.aspx) . I have also tried with rewritted name like  url: "trial.aspx/GetCustomers", but still it's not working. How I can configure to work for my url rewritten page.