/*
	mouse wheel hendler
	suba

*/



if (window.addEventListener)
        window.addEventListener('DOMMouseScroll', wheel, false);
		window.onmousewheel = document.onmousewheel = wheel;


function handle(delta) {
        if (delta <= 0)
			so_xfade();
        else
			promeni_redosled();
}


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)
                handle(delta);

        if (event.preventDefault)
                event.preventDefault();
	event.returnValue = false;
}