I have asimilar problem. I am still very new, please guide me.

When I created a new WebApplication, it works fine. Creating Sqlconnection, and the grid showed up.

And now I want to put it into my friend's existing work, which I believe is a Web Site. I basically just did the method, everything exactly the same. But when I run debug, the page only shows a blank page. The grid doesn't show up at all.
The Firebug shows “1 error” saying the jqgrid is not a function.

I run these both on the same browser, Firefox 4. I don't know what is going on.
Please help me.