VBScript - XML from html site

Hello,

I wrote a program which parses some specific data from a website.
This is how I get the Values:

set xmlhttp = createobject("msxml2.xmlhttp.3.0")
xmlhttp.open  "get","url", false
xmlhttp.send

The Problem is, it does not update. It only works the first time you start the program.

PS: A funny dude said altering the URL would work but this is just retarded, I don´t want another URL, I always want the same.

Thanks in advance guys.