asp.net不呈现Sys.WebForms.PageRequestManager._initialize代码

i'm using the ASP.NET 2.0 Ajax Extensions on a web site. as always, everything is fine on local but the remote web site does not use ajax calls. my local server has the ASP.NET Ajax extensions installed but the remote one doesn't. i know that i should be able to use the Ajax extensions without installing them. so in turn, i added the extensions' .dll among the web site's references but still no luck.i'm using the ASP.NET 2.0 Ajax Extensions on a