var currentSection = "page1-pan";
var tabTag = "-tab";
var paneTag = "-pan";
var scrollanim = {time:0, begin:0, change:0.0, duration:0.0, element:null, timer:null};

function ScrollSection(link, scrollArea, offset){
	if (currentSection == link)return;
	lastSection = currentSection;
	currentSection = link;

    sectionTab = currentSection.split("-")[0] + tabTag;
    document.getElementById(sectionTab).className = "active";
    if (lastSection) {
	    lastTab = lastSection.split("-")[0] + tabTag;
	    document.getElementById(lastTab).className = "inactive";
	}

	theScroll = document.getElementById(scrollArea);
	position = findElementPos(document.getElementById(link));

	if (offset != "") {
		offsetPos = findElementPos(document.getElementById(offset));
		position[0] = position[0] - offsetPos[0];
	}

	scrollStart(theScroll, theScroll.scrollLeft, position[0], 25);
}

function findElementPos(elemFind){
	var elemX = 0;
	var elemY = 0;
	do {
		elemX += elemFind.offsetLeft;
		elemY += elemFind.offsetTop;
	} while ( elemFind = elemFind.offsetParent )
	return Array(elemX, elemY);
}

function scrollStart(elem, start, end, duration){
	if (scrollanim.timer != null) {
		clearInterval(scrollanim.timer);
		scrollanim.timer = null;
	}
	scrollanim.time = 0;
	scrollanim.begin = start;
	scrollanim.change = end - start;
	scrollanim.duration = duration;
	scrollanim.element = elem;
	scrollanim.timer = setInterval("scrollHorizAnim();",18);
}

function scrollHorizAnim(){
	if (scrollanim.time > scrollanim.duration) {
		clearInterval(scrollanim.timer);
		scrollanim.timer = null;
	}
	else {
		move = sineInOut(scrollanim.time, scrollanim.begin, scrollanim.change, scrollanim.duration);
		scrollanim.element.scrollLeft = move;
		scrollanim.time++;
	}
}

function sineInOut(t, b, c, d){return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;}

function ScrollArrow(direction, toolbar, scrollArea, offset){
	toolbarElem = document.getElementById(toolbar);
	toolbarNames = new Array();

	if (toolbarElem.hasChildNodes()){
		var children = toolbarElem.childNodes;
		for (var i = 0; i < children.length; i++) 
		{
			if (toolbarElem.childNodes[i].tagName == "A") {
				toolbarNames.push(toolbarElem.childNodes[i].id.split("-")[0]);
			}
		}
	}
	for (var i = 0; i < toolbarNames.length; i++) {
		if (toolbarNames[i] == currentSection.split("-")[0]) {
			if (direction == "left") {
				if (i - 1 < 0) {
					gotoTab = toolbarNames[toolbarNames.length - 1];
				} else {
					gotoTab = toolbarNames[i - 1];
				}
			} else {
				if ((i + 1) > (toolbarNames.length - 1)) {
					gotoTab = toolbarNames[0];
				} else {
					gotoTab = toolbarNames[i + 1];
				}
			}
		}
	}
	ScrollSection(gotoTab+paneTag, scrollArea, offset);
}


function init(){
	scrollStart(document.getElementById('scroller'), 2253, 3004, 1);
	//scrollStart(document.getElementById('scroller'), 4500, 3750, 1);
}