[jQuery] project/jCache + path incorrect?

[HanSolo]

Hello,

i want to use the jquery-plugin:
http://plugins.jquery.com/project/jCache

but it doesnt work realy good. My problem is maybe very easy but im
blind :(

im using this script 1&1 and change onyl the path for a loading file
from this function here:
function loadFakeData(no)
{
        makeRequest("", "demo/mydemo.html" + no, '', "demoContent",
"demoLoading");

but the text into this file is never loading. the onyl messasge i
become is:Couldnot retrieve information.

The script jcache.js is with the actualy jquery version in the folder
js.
whats my mistake? need help please

reg
han