function upon() {

aktiv = window.setInterval("NachOben()",10);
}




function NachOben() {

parent.center.content.scrollBy(0,1)
}




function upfast() {

aktiv1 = window.setInterval("fastup()",10);
}




function fastup() {

parent.center.content.scrollBy(0,10)
}




function downon() {

    aktiv = window.setInterval("NachUnten()",10);
}




function NachUnten() {

    parent.center.content.scrollBy(0,-1)
}




function downfast() {

aktiv2 = window.setInterval("fastdown()",10);
}




function fastdown() {

parent.center.content.scrollBy(0,-10)
}





function stop() {

    window.clearInterval(aktiv);

}



function stop1() {

    window.clearInterval(aktiv1);

}



function stop2() {

    window.clearInterval(aktiv2);

}