margin = 0;
klick = 1;
contentmenge = 6;
contentmengenklicks = contentmenge;

function sliderLeft() {
if (klick <= 1) {
return 0;
}
else {
klick=klick - 1;
document.getElementById('slider').style.marginLeft = margin +530 + 'px';
margin = margin + 530;
}
}


function sliderRight() {
if (klick >= contentmengenklicks) {
return 0;
}
else {
document.getElementById('slider').style.marginLeft = margin -530 + 'px';
margin = margin - 530;
klick=klick + 1;
}
}