function center(){
    var abstand, breite;
    
    if (navigator.appName == "Microsoft Internet Explorer") {
        // alert('IE');
        // alert(screen.width);
        
        breite = screen.width;
        
        if(breite <= 955)
            return;
        
        abstand = breite - 955;
        abstand = abstand / 2;
        
        document.body.style.paddingLeft = abstand + "px";
        document.body.style.paddingRight = abstand + "px";
    }
    else if (navigator.appCodeName == "Mozilla") {
        // alert("FF");
        // alert(screen.width);
        
        breite = screen.width;
        
        if(breite <= 955)
            return;
        
        abstand = breite - 955;
        abstand = abstand / 2;
        
        document.body.style.paddingLeft = abstand + "px";
        document.body.style.paddingRight = abstand + "px";
    }    
}