var currentSection = "_1-imagen";

var tabTag = "-tab";

var paneTag = "-imagen";

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], "horiz");

}

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 == "LI") {

				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);

}

var scrollanim = {time:0, begin:0, change:0.0, duration:0.0, element:null, timer:null};

function scrollStart(elem, start, end, direction){

	if (scrollanim.timer != null) {

		clearInterval(scrollanim.timer);

		scrollanim.timer = null;

	}

	scrollanim.time = 0;

	scrollanim.begin = start;

	scrollanim.change = end - start;

	scrollanim.duration = 10;

	scrollanim.element = elem;	

	if (direction == "horiz") {

		scrollanim.timer = setInterval("scrollHorizAnim();", 15);

	}else {

		scrollanim.timer = setInterval("scrollVertAnim();", 15);

	}

}

function scrollVertAnim(){

	if (scrollanim.time > scrollanim.duration) {

		clearInterval(scrollanim.timer);

		scrollanim.timer = null;

	}else {

		move = sineInOut(scrollanim.time, scrollanim.begin, scrollanim.change, scrollanim.duration);

		scrollanim.element.scrollTop = move; 

		scrollanim.time++;

	}

}

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 findElementPos(elemFind){

	var elemX = 0;

	var elemY = 0;

	do {

		elemX += elemFind.offsetLeft;

		elemY += elemFind.offsetTop;

	} while ( elemFind = elemFind.offsetParent )

	return Array(elemX, elemY);

}