Neat little script but you'll need to replace the following two variables (g1url,g0url) with:

var g1url = 'http://www.newzleech.com/usenet/?group=&minage=&age=80&min=min&max=max&q=&mode=usenet&adv=1&q=$1 $2';
var g0url = 'http://www.newzleech.com/usenet/?group=&minage=&age=80&min=min&max=max&q=&mode=usenet&adv=1&q=$1';