//1) Set width of the "neutral" area in the center of the gallery.
var restarea = 20;
 //2) Set top scroll speed in pixels. Script auto creates a range from 0 to top speed.
var maxspeed = 7;
 //3) Set to maximum width for gallery - must be less than the actual length of the image train.
var maxwidth = 2000;

var iedom = document.all || document.getElementById,
	scrollspeed = 5,
	movestate = '',
	actualwidth = '',
	cross_scroll,
	loadedyes = 0,
	lefttime,
	righttime,
	crossmain,
	menuwidth;

function ietruebody() {
	return (document.compatMode && document.compatMode != "BackCompat") ? document.documentElement : document.body;
}

function getposOffset(what, offsettype) {
	var totaloffset = (offsettype == "left") ? what.offsetLeft : what.offsetTop;
	var parentEl = what.offsetParent;
	while (parentEl != null) {
		totaloffset = (offsettype == "left")? totaloffset + parentEl.offsetLeft : totaloffset + parentEl.offsetTop;
		parentEl = parentEl.offsetParent;
	}
	return totaloffset;
}


function moveleft() {
	if (loadedyes) {
		movestate = "left";
		if (parseInt(cross_scroll.style.left) > (menuwidth - actualwidth)) {
			cross_scroll.style.left = parseInt(cross_scroll.style.left) - scrollspeed + "px";
		}
	}
	lefttime = setTimeout("moveleft()", 10);
}

function moveright() {
	if (loadedyes) {
		movestate = "right";
		if (parseInt(cross_scroll.style.left) < 0) {
			cross_scroll.style.left = parseInt(cross_scroll.style.left) + scrollspeed + "px";
		}
	}
	righttime = setTimeout("moveright()", 10);
}

function motionengine(e) {
	var mainobjoffset = getposOffset(crossmain, "left"),
		dsocx = (window.pageXOffset) ? pageXOffset : ietruebody().scrollLeft,
		dsocy = (window.pageYOffset) ? pageYOffset : ietruebody().scrollTop,
		curposy = window.event ? event.clientX : e.clientX ? e.clientX : "";
		curposy -= mainobjoffset - dsocx;
		
	var leftbound = (menuwidth - restarea) / 2;
	var rightbound = (menuwidth + restarea) / 2;
	if (curposy > rightbound) {
		scrollspeed = (curposy - rightbound) / leftbound * maxspeed;
		clearTimeout(righttime);
		if (movestate != "left") { moveleft(); }
	}
	else if (curposy < leftbound) {
		scrollspeed = (leftbound - curposy) / leftbound * maxspeed;
		clearTimeout(lefttime);
		if (movestate != "right") { moveright(); }
	}
	else {
		scrollspeed = 0;
	}
}

function contains_ns6(a, b) {
	if (b !== null) {
		while (b.parentNode)
		{
			if ((b = b.parentNode) == a) return true;
		}
	}
	return false;
}

function stopmotion(e) {
	if (!window.opera || (window.opera && e.relatedTarget !== null)) {
		if ((window.event && !crossmain.contains(event.toElement)) || (e && e.currentTarget && e.currentTarget!= e.relatedTarget && !contains_ns6(e.currentTarget, e.relatedTarget))) {
			clearTimeout(lefttime);
			clearTimeout(righttime);
			movestate = "";
		}
	}
}

function fillup() {
	if (iedom) {
		crossmain = get_elem("motion");
		if(typeof crossmain.style.maxWidth !== 'undefined') crossmain.style.maxWidth = maxwidth + 'px';
		menuwidth = get_elem("motion").offsetWidth;
		cross_scroll = get_elem("motiongallery");
		cross_scroll.style.left = 0;
		actualwidth = get_elem("trueContainer").offsetWidth;
		crossmain.onmousemove = function(e) {
			motionengine(e);
		};

		crossmain.onmouseout = function(e) {
			stopmotion(e);
		};
	}
	loadedyes = 1
}