var slider
InitSlider = function (){

		slider = new Control.Slider('handle', 'scrollTrack', {
			onSlide: function(v) { scrollHorizontal(v, $('gallery'), slider);  },
			onChange: function(v) { scrollHorizontal(v, $('gallery'), slider); },
			alignX : 20
		});

}

window.onload = InitSlider;
window.onresize  = InitSlider;

function scrollHorizontal(value, element, slider) {
	 element.scrollLeft = Math.round(value/slider.maximum*(element.scrollWidth-element.offsetWidth));
}

function scrollVertical(value, element, slider) {
	element.scrollTop = Math.round(value/slider.maximum*(element.scrollHeight-element.offsetHeight));
}


/** This is high-level function.
 * It must react to delta being more/less than zero.
 */
function handle(delta) {
	$('gallery').scrollLeft -= delta*100;
	/*
	var handle = $('handle');
	var cur_pos = handle.offsetLeft-50;
	var max_pos = handle.offsetParent.offsetWidth - handle.offsetWidth-50;
	if (delta <0) {
		var position = cur_pos + 10
		if (position < max_pos) {
			handle.style.left = position + 'px'
			scrollHorizontal(position, $('gallery'), slider)
			$('gallery').scrollLeft += 10;
		}
	} else {
		var position = cur_pos - 10
		if ( position > 0) {
			handle.style.left = position + 'px'
			$('gallery').scrollLeft -= 10;
		}
	}

	//$('handle').style.left += delta*10;

	//scrollHorizontal(delta, 'gallery', slider);
*/
}

/** 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);
        /** 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.
 */
if (window.addEventListener)
        /** DOMMouseScroll is for mozilla. */
        window.addEventListener('DOMMouseScroll', wheel, false);
/** IE/Opera. */
window.onmousewheel = document.onmousewheel = wheel;