slide={};
slide.i=0;
slide.stop=1;
slide.element=false;

slide.setEl=function (el){

        this.element=document.getElementById(el);
        this.stop=0;
}

scrollUp=function(){
        var slide=window.slide;
        if (slide.i>=3){
                slide.i=slide.i-3;
        }else if (slide.i<3 && slide.i>=0){
                slide.i=0;
                slide.stop=1;
        }
        slide.element.scrollTop=slide.i;
        if (!slide.stop)
                setTimeout('scrollUp();', 2);
}
scrollDown=function(){
        var slide=window.slide;
        var scroll=slide.element.scrollTop;
        if ((slide.i-5)<=scroll) {
                slide.i=slide.i+3;
        } else if ((slide.i-5)>scroll) {
                slide.i=scroll;
                slide.stop=1;
        }
        slide.element.scrollTop=slide.i;
        if (!slide.stop)
                setTimeout('scrollDown();', 2);
}

slide.scrollStop=function(){
        this.stop=1;
}