// JavaScript Document

function wheel(event)
{

var delta = 0;

if (!event)
{
event = window.event;
}

if (event.wheelDelta)
{
delta = event.wheelDelta/120;
if (window.opera)
{
delta = -delta;
}
}

else if (event.detail)
{
delta = -event.detail/3;
}

if (delta)
{
if (delta < 0)
{
window.scrollBy(0,sdr);
}
else
{
window.scrollBy(0,-sdr);
}
}
}


if (window.addEventListener) { window.addEventListener('DOMMouseScroll', wheel, false); }

window.onmousewheel = document.onmousewheel = wheel;


sdr = document.documentElement.clientHeight*0.15;

function setsdr()
{
sdr = document.documentElement.clientHeight*0.15;
// alert('debug');
}

window.onload = setsdr;
window.onresize = setsdr;