var scrollTips = {
	dx : null,
	init : function() {	
		if (window.addEventListener) {
		window.addEventListener("DOMMouseScroll", this.mouseScroll, false);
		} else document.attachEvent("onmousewheel", this.mouseScroll); 
		var left = document.getElementById('left');
		addEvent(left,'mouseover', function() {this.dx=setInterval('scrollTips.arrowScroll(0)',100);return false;});
		addEvent(left,'mouseout', function() { clearInterval(this.dx); return false;});
		var right = document.getElementById('right');
		addEvent(right,'mouseover', function() {this.dx=setInterval('scrollTips.arrowScroll(1)',100);return false;});
		addEvent(right,'mouseout', function() { clearInterval(this.dx); return false;});
	},
	mouseScroll : function(e) {
		if (!e) var e = window.event;
		  var scroll = e.detail ? e.detail * 20 : e.wheelDelta / -20;
		if (scroll>=0 ){  
		window.scrollBy(80,0);
		} else  window.scrollBy(-80,0) ; 
	},	
	arrowScroll: function(val) {
		if(val==1) {
			window.scrollBy(70,0);
		} else {
			window.scrollBy(-70,0)
		}
	}
}


function addEvent( obj, type, fn ) {
	if (obj.addEventListener)
		obj.addEventListener( type, fn, false );
	else if (obj.attachEvent) {
		obj["e"+type+fn] = fn;
		obj[type+fn] = function() { obj["e"+type+fn]( window.event ); }
		obj.attachEvent( "on"+type, obj[type+fn] );
	}
}

function removeEvent( obj, type, fn ) {
	if (obj.removeEventListener)
		obj.removeEventListener( type, fn, false );
	else if (obj.detachEvent) {
		obj.detachEvent( "on"+type, obj[type+fn] );
		obj[type+fn] = null;
		obj["e"+type+fn] = null;
	}
}

// mouse wheel scroll for safari
function handle(delta) {
	var iAantalPixels = 75;
	if (delta < 0 ) {
		window.scrollBy(iAantalPixels, 0);
	}
	else {
		window.scrollBy(-iAantalPixels, 0);
	}
}

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);
	}
}
/* Initialization code. */
if (window.addEventListener) {
	window.addEventListener('DOMMouseScroll', wheel, false);
	window.onmousewheel = document.onmousewheel = wheel;
}