// <![CDATA[
var node        = null;
var node_proc   = null;
var timer       = null;
var scrollHeight= 0;
var offsetHeight= 0;
var timer       = null;

window.onload = function()
{
    node        = document.getElementById('hmm');
    node_suwak  = document.getElementById('suwak');
    scrollHeight= node.scrollHeight;
    offsetHeight= node.offsetHeight;
}

function przesun(krok)
{
    if(node.scrollTop+krok>scrollHeight)
    {
        node.scrollTop=scrollHeight;
    }
    else if(node.scrollTop+krok<0)
    {
        node.scrollTop=0;
    }
    else
    {
        node.scrollTop = node.scrollTop+krok
    }
    node_suwak.style.top = parseInt(240*node.scrollTop/(scrollHeight-offsetHeight),10)+'px';
}


// ]]>