/* Horizontal Tiny Scrolling - a smooth scrolling script for horizontal websites
by Marco Rosella - http://lab.centralscrutinizer.it/the-tiny-scrollings
v0.8 - July 7, 2009	*/

window.onload = function() {
	HtinyScrolling.init();
	scrollTips.init();
}

var HtinyScrolling = {
	speed : 50,      //set here the scroll speed: when this value increase, the speed decrease. 
	maxStep: 150,	 //set here the "uniform motion" step for long distances
	brakeK: 3,		 //set here the coefficient of slowing down
	hash: null,
	currentBlock: null,
	requestedX: 0,
	init: function() {
		var lnks = document.getElementsByTagName("a");   
		for(var i = 0, lnk; lnk = lnks[i]; i++) {   
			if ((lnk.href && lnk.href.indexOf("#") != -1) &&  ((lnk.pathname == location.pathname) || ("/" + lnk.pathname == location.pathname)) && (lnk.search == location.search)) {  
				addEvent(lnk,'click',HtinyScrolling.initScroll,false);
				lnk.onclick = function() {return false;} // Safari
			}
		}
	},
	getTarget: function(target) {
		while(target.tagName.toLowerCase() != "a") {
			target = target.parentNode;
		}
		return target;
	},
	getElementXpos: function(el){
		var x = 0;
		while (el.offsetParent) {  
			x += el.offsetLeft;    
			el = el.offsetParent;
		}
		return x;
	},
	getScrollLeft: function() {
		if (document.all) {return (document.documentElement.scrollLeft) ? document.documentElement.scrollLeft : document.body.scrollLeft;}
		else return window.pageXOffset;   
	},	
	getWindowWidth: function() {
		if (window.innerWidth)	{return window.innerWidth;}
		if (document.documentElement && document.documentElement.clientWidth) {return document.documentElement.clientWidth;}
	},
	getDocumentWidth: function(){
		if (document.width) {return document.width;}
		if(document.body.offsetWidth) {return document.body.offsetWidth;}
	},
	initScroll: function(e) {
		var targ;  
		if (!e) {var e = window.event;}
		if (e.target) {targ = e.target;}
		else if (e.srcElement) {targ = e.srcElement;}
		targ = HtinyScrolling.getTarget(targ);  //a fix by Skid X
		HtinyScrolling.hash = targ.href.substr(targ.href.indexOf('#')+1,targ.href.length); 
		HtinyScrolling.currentBlock = document.getElementById(HtinyScrolling.hash);   
		if (!HtinyScrolling.currentBlock) {return;}
		HtinyScrolling.requestedX = HtinyScrolling.getElementXpos(HtinyScrolling.currentBlock); 
		HtinyScrolling.scroll(targ); 
		return false;
	},
	scrollToIt: function(targ){ //thanks to Michael Ionita-Ganea
		target = document.getElementById(targ);
		HtinyScrolling.currentBlock = document.getElementById(targ);
		if (!HtinyScrolling.currentBlock) {return;}
		HtinyScrolling.requestedX = HtinyScrolling.getElementXpos(HtinyScrolling.currentBlock);
		HtinyScrolling.scroll(target);
		return false;
		
	},
	scroll: function(targ) {
		var left  = HtinyScrolling.getScrollLeft();
		if (HtinyScrolling.requestedX > left) { //a fix by Michael Ionita-Ganea
			var endDistance = Math.round((HtinyScrolling.getDocumentWidth() - (left + HtinyScrolling.getWindowWidth())) / HtinyScrolling.brakeK);
			endDistance = Math.min(Math.round((HtinyScrolling.requestedX-left)/ HtinyScrolling.brakeK), endDistance);
			var offset = Math.min(Math.abs(Math.round((HtinyScrolling.requestedX-left)/ HtinyScrolling.brakeK)), HtinyScrolling.maxStep);
		}
		else {
			var offset = - Math.min(Math.abs(Math.round((HtinyScrolling.requestedX-left)/ HtinyScrolling.brakeK)), HtinyScrolling.maxStep);
		} 
		window.scrollTo(left + offset, 0);
		if (Math.abs(left-HtinyScrolling.requestedX) <= 1 || HtinyScrolling.getScrollLeft() == left) {
			HtinyScrolling.hash = null;
		}
		else {
			setTimeout(HtinyScrolling.scroll,HtinyScrolling.speed);
		}
	}
}

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] );
	}*/
}