var tmpimg = "";

var temp_y = 0
var up = false
var down =true
function scrollUp(){
    if(up==true){
        var coFx = new Fx.Scroll('table_content',{duration: 1500,transition: Fx.Transitions.Quad.easeInOut});
        temp_y-=300;
       coFx.start(0,temp_y);
        scrollcheck();
    }
}
function scrollDown(){
    var coFx = new Fx.Scroll('table_content',{duration: 1500,transition: Fx.Transitions.Quad.easeInOut});
    if(down==true){
        temp_y+=300
        coFx.start(0,temp_y);
        scrollcheck();
    }
}

function scrollcheck(){
    pos  = $('table_content').getPosition();
    scrollsize = $('table_content').getScrollSize();
    size=$('table_content').getSize()
    down=true
    up=true
    $('scroller-runter').setStyle('visibility','visible')
    $('scroller-hoch').setStyle('visibility','visible')
    if(temp_y+ size.y>470||size.y<470){
        down=false;
        $('scroller-runter').setStyle('visibility','hidden')
    }
    if(temp_y<=0){
         up =false;
        $('scroller-hoch').setStyle('visibility','hidden')
    }
}

window.addEvent('domready', function() {

    scrollcheck()
    if(down==true){
        $('scoller').setStyle('visibility','visible')
        $$('.content #table_content').setStyle('overflow','hidden')
    }
    $('scroller-runter').addEvent(
                'click', function(){
                    scrollDown();
                }
            );
    $('scroller-hoch').addEvent(
                'click', function(){
                    scrollUp();
                }
            );
});