var i=0;
var scroll_break=1;
var div;

function set_div(d){

        div=d;
}

function scroll_up(cont){
        if (cont!=1)
                scroll_break=1;
        if (i>=3){
                i=i-3;
        }else if (i<3 && i>=0){
                i=0;
                scroll_break=0;
        }
        document.getElementById(div).scrollTop=i;
        if (scroll_break)
                setTimeout('scroll_up(1);', 2);
        else
                scroll_break=1;
}
function scroll_down(cont){

        if (cont!=1)
                scroll_break=1;
        var scroll=document.getElementById(div).scrollTop;
        if ((i-5)<=scroll)
                i=i+3;
        else if ((i-5)>scroll){
                i=scroll;
                scroll_break=0;
        }
        document.getElementById(div).scrollTop=i;
        if (scroll_break)
                setTimeout('scroll_down(1);', 2);
        else
                scroll_break=1;
}

function scroll_breaker(){
        scroll_break=0;
}



function hide_elem(id){
        window.document.getElementById(id).style.display='none';
}
function show_elem(id){
        window.document.getElementById(id).style.display='block';
}