var curheight = 0;
window.addEvent('domready', function() {
  if (window.addEventListener)
        /** DOMMouseScroll is for mozilla. */
        window.addEventListener('DOMMouseScroll', wheel, false);
/** IE/Opera. */
//window.onmousewheel = document.onmousewheel = wheel;
//    window.getScroll().addEvent('click', function(evt){
//    });
});

function handle(delta, event) {
    if(event.target.hasClass('select_item_text')) {
        curheight=event.target.getParent('ul').getScrollTop();
        if (delta < 0) {
            var maxheight = (event.target.getParent('ul').getLast('div').id.split('-').pop().toInt()-6)*event.target.getParent().getHeight().toInt();
            if(curheight >= maxheight) {
                curheight = maxheight;
            } else {
                curheight = curheight + event.target.getParent().getHeight();
            }
            event.target.getParent('ul').scrollTo(0, curheight);
        } else {
            if(curheight > 0) {
                curheight = curheight - event.target.getParent().getHeight();
            } else {
                curheight = 0;
            }
            event.target.getParent('ul').scrollTo(0, curheight);
        }
        event.preventDefault();
    }
}

/** Event handler for mouse wheel event.
 */
function wheel(event){
        var delta = 0;
        if (!event) /* For IE. */
                event = window.event;
        if (event.wheelDelta) { /* IE/Opera. */
                delta = event.wheelDelta/120;
                /** In Opera 9, delta differs in sign as compared to IE.
                 */
                if (window.opera)
                        delta = delta;
        } else if (event.detail) { /** Mozilla case. */
                /** In Mozilla, sign of delta is different than in IE.
                 * Also, delta is multiple of 3.
                 */
                delta = -event.detail/3;
        }
        /** If delta is nonzero, handle it.
         * Basically, delta is now positive if wheel was scrolled up,
         * and negative, if wheel was scrolled down.
         */
        if (delta)
                handle(delta, event);
        /** Prevent default actions caused by mouse wheel.
         * That might be ugly, but we handle scrolls somehow
         * anyway, so don't bother here..
         */
       /* if (event.preventDefault)
                event.preventDefault();
	event.returnValue = false; */
}

/** Initialization code.
 * If you use your own event management code, change it as required.
 */