// Scroll: Setup Scrolling Stuff

var currentSection = "z1-pane"; // The default loaded section on the page
var tabTag = "-tab";
var paneTag = "-pane";

// Scroll the page manually to the position of element "link", passed to us.

function ScrollSection(link, scrollArea, offset)
{

	// Store the last section, and update the current section

	if (currentSection == link) {
		return;
	}
	lastSection = currentSection;
	currentSection = link;
	
	// Change the section highlight.
	// Extract the root section name, and use that to change the background image to 'top', revealing the alt. state

    sectionTab = currentSection.split("-")[0] + tabTag;
    document.getElementById(sectionTab).className = "active";
    if (lastSection) {
	    lastTab = lastSection.split("-")[0] + tabTag;
	    document.getElementById(lastTab).className = "inactive";
	}
    
	// Get the element we want to scroll, get the position of the element to scroll to
	
	theScroll = document.getElementById(scrollArea);
	position = findElementPos(document.getElementById(link));

	// Get the position of the offset div -- the div at the far left.
	// This is the amount we compensate for when scrolling
	
	if (offset != "") {
		offsetPos = findElementPos(document.getElementById(offset));
		position[0] = position[0] - offsetPos[0];
	}
	
	if (lastSection == "end-pane") {
		scrollStart1(theScroll, theScroll.scrollLeft, position[0]);
		// theScroll.element.scrollLeft = position[0];
	} else {
		scrollStart(theScroll, theScroll.scrollLeft, position[0]);
	}

	// return false;
}

// Scroll the page using the arrows

function ScrollArrow(direction, toolbar, scrollArea, offset) {

	toolbarElem = document.getElementById(toolbar);
	toolbarNames = new Array();
    
	// Find all the <li> elements in the toolbar, and extract their id's into an 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]);
			}
		}
	}

	// Now iterate through our array of tab names, find matches, and determine where to go.

	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];
				}
			}
		}
	}
	
	// Go to the section name!
	
	ScrollSection(gotoTab+paneTag, scrollArea, offset);

}

//
// Animated Scroll Functions
// Scrolls are synchronous -- only one at a time.
//

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

function scrollStart(elem, start, end)
{
	if (scrollanim.timer != null) {
		clearInterval(scrollanim.timer);
		scrollanim.timer = null;
	}
	scrollanim.time = 0;
	scrollanim.begin = start;
	scrollanim.change = end - start;
	scrollanim.duration = 100;
	scrollanim.element = elem;
	scrollanim.timer = setInterval("scrollHorizAnim();", 15);
}

function scrollStart1(elem, start, end)
{
	scrollanim.change = end - start;
	scrollanim.element = elem;
	scrollanim.element.scrollLeft = scrollanim.change;
}

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

var zzz_count = 0;
var zzz_start = 0;

function scrollBeginHP()
{
	if ((zzz_count == 0) && (zzz_start == 1)) {
		timerXXX = setTimeout("ScrollArrow('right','toolbar','scroller','z1-pane'); zzz_count++; scrollZZZ();", 10);
	} else {
		timerXXX = setTimeout("ScrollArrow('right','toolbar','scroller','z1-pane'); zzz_count++; scrollZZZ();", 1500);
	}
}

function scrollZZZ()
{
	zzz_start = 1;
	if (zzz_count == 15) {
		zzz_count = 0;
		scrollBeginHP();
	} else {
		timerZZZ = setTimeout("ScrollArrow('right','toolbar','scroller','z1-pane'); zzz_count++; scrollBeginHP();", 10000);
	}
}