Need Help with Project Variable

Hello,

I just started a few days ago with TestComplete 9 and made my first experiences. Now i wanted to create several scripts/units which use variables from other scripts/units. I already read the section at the support site, but my code still didn't work as expected...

Since I'm out of ideas I hope somebody in this board could help me ;).

The script as simple as can be...

The first script:

//USEUNIT OpenUp

Project.Variables.browser= Browsers.Item(btFirefox);

function FuseAll()
{
  OpenUp.OpenUp();
}

The second script

function OpenUp()
{
  //browser = Browsers.Item(btFirefox);
  browser.Run("http://192.168.100.23/")
}

When execute I always get the Error >> 'browser' is undefined' <<.

I also wrote the Variable in the 'Temporary Variables' and declared it as an 'Object'.

So, what is the problem in my process?

Thanks for help in advance