adsense plugin error

Who can help me? I downloaded the adsense deluxe plugin and activated it. This worked fine. But when I enter the adsense code and try to save these settings, I will get an ‘500 internal server error’. When I delete the javascript lines whit the URL to the .js file, the saving works. So the problem is javascript code I guess!?
The problem is, that I am not that much into PHP and Javascript. Is there anybody who had the same problem?
And do I have to find this in the .htaccess file?

Thanks.