function openSite() {

        //get screen dimensions
        if (self.screen) {
                sw = self.screen.width;
                sh = self.screen.height;
        } else return;

        //set props
        w=400;
        h=550;
        url='tele.html';
        title = 'tele';
        winProperties = 'height='+h+',width='+w+',toolbar=no,location=no,scrollbars=no,titlebar=no,menubar=no,resizable=no,status=no';

        //open and move
        win = window.open(url,title, winProperties);
        win.moveTo((sw-w)/2,(sh-h)/2);
}
//open popup that contains site
function openSite1() {

        //get screen dimensions
        if (self.screen) {
                sw = self.screen.width;
                sh = self.screen.height;
        } else return;

        //set props
        w=550;
        h=250;
        url='leistungen.html';
        title = 'leistungen';
        winProperties = 'height='+h+',width='+w+',toolbar=no,location=no,scrollbars=no,titlebar=no,menubar=no,resizable=no,status=no';

        //open and move
        win = window.open(url,title, winProperties);
        win.moveTo((sw-w)/2,(sh-h)/2);
}