var scTopTO;
function ScrollTop(id,dis,pos){
    var obj=document.getElementById(id)
    obj.scrollTop=obj.scrollTop+dis;
    if (pos){obj.scrollTop=pos; }
    else {scTopTO=setTimeout( function(){ ScrollTop(id,dis); },30); }
}


var scLeftTO;
function ScrollLeft(id,dis,pos){
    var obj=document.getElementById(id)
    obj.scrollLeft=obj.scrollLeft+dis;
    if (pos){obj.scrollLeft=pos; }
    else {scLeftTO=setTimeout( function(){ ScrollLeft(id,dis); },1); }
}



function ShowScroller(box, obsah, scroller) {
     var box_height = document.getElementById(box).offsetHeight;
     var obsah_height = document.getElementById(obsah).offsetHeight;

     if (box_height < obsah_height) {
        document.getElementById(scroller).style.display = 'block';
     }
}