/* =======================================================
 * ypSimpleScroll
 * 3/11/2001
 *
// dhtml scrolling panel featuring scrolling in any
// direction, smooth frame-dropping animation, and a
// few other goodies.
//
// 3/25/2001
// added scrolling in any direction and initTop, initLeft
// constructor parameters - with only 1k...
//
// 3/30/2001
// fixed bug that occured when if you called scrollTo( )
// and the new position was the same as the current
// position. that was stupid.
//
// 4/02/2001
// small bug fix - on some browsers, on slow connections
// the script would not run at all. to be sure the doc
// is done loading before .load() is called, the author
// must now call the .load() method in the onload handler
// for the page.
//
// 8/22/2001
// if you tried to scroll before page was loaded it threw
// an error. this should be fixed now.
//
//
 * http://www.youngpup.net/
//
// =======================================================
// ypSimpleScroll(	id, left, top, width, height, speed,
//					contentWidth, initScrollLeft,
//					initScrollTop	)
//
// last three parameters are optional.
 * ======================================================= */


// basic methods.
ypSimpleScroll.prototype.scrollNorth = function() { this.startScroll(90) }
ypSimpleScroll.prototype.scrollSouth = function() { this.startScroll(270)  }
ypSimpleScroll.prototype.scrollWest  = function() { this.startScroll(180) }
ypSimpleScroll.prototype.scrollEast  = function() { this.startScroll(0)   }


// start scrolling in an arbitrary direction, with an optional arbitrary speed.
// if no speed is provided, the default speed from the constructor parameter is used.
ypSimpleScroll.prototype.startScroll = function(deg, speed) {
	if (this.loaded)
	{
		if (this.aniTimer)
		    window.clearTimeout(this.aniTimer);
		this.overrideScrollAngle(deg);
        this.speed    = speed ? speed : this.origSpeed;
		this.lastTime = (new Date()).getTime() - this.y.minRes;
		this.aniTimer = window.setTimeout(this.gRef + ".scroll()", this.y.minRes);
	}
}

// kills pending calls to .scroll(), resets speed
ypSimpleScroll.prototype.endScroll = function() {
	if (this.loaded)
	{
		window.clearTimeout(this.aniTimer);
		this.aniTimer = 0;
		this.speed = this.origSpeed;
	}
}

// override the current angle from startScroll() with a new angle
// this method should not be used with scrollTo() because it will
// override the angle created by the first two params to scrollTo().
ypSimpleScroll.prototype.overrideScrollAngle = function(deg) {
	if (this.loaded)
	{
		deg = deg % 360;
		if (deg % 90 == 0) {
			var cos = deg == 0  ? 1 : deg == 180 ? -1 : 0;
			var sin = deg == 90 ? -1 : deg == 270 ? 1 : 0;
		} else {
			var angle = deg * Math.PI / 180;
			var cos   = Math.cos(angle);
			var sin   = Math.sin(angle);
			sin = -sin;
		}
		this.fx = cos / (Math.abs(cos) + Math.abs(sin));
		this.fy = sin / (Math.abs(cos) + Math.abs(sin));
		this.stopH = deg == 90 || deg == 270 ? this.scrollLeft : deg < 90 || deg > 270 ? this.scrollW : 0;
		this.stopV = deg == 0 || deg == 180 ? this.scrollTop : deg < 180 ? 0 : this.scrollH;
	}
}

// override the speed for the current scroll.
// should not be used with scrollTo, unless you want to
// override the speed computed from the aniLen param of scrollTo()
ypSimpleScroll.prototype.overrideScrollSpeed = function(speed) {
	if (this.loaded)
	    this.speed = speed;
}

// scroll to an arbitrary position in two dimensions over in
// an arbitrary lenth of time.
ypSimpleScroll.prototype.scrollTo = function(stopH, stopV, aniLen) {
	if (this.loaded)
	{
		if (stopH != this.scrollLeft || stopV != this.scrollTop) {
			if (this.aniTimer) window.clearTimeout(this.aniTimer);
			this.lastTime = (new Date()).getTime();
			var dx = Math.abs(stopH - this.scrollLeft);
			var dy = Math.abs(stopV - this.scrollTop);
			var d = Math.sqrt(Math.pow(dx,2) + Math.pow(dy,2));
			this.fx = (stopH - this.scrollLeft) / (dx + dy);
			this.fy = (stopV - this.scrollTop) / (dx + dy);
			this.stopH = stopH;
			this.stopV = stopV;
			this.speed = d / aniLen * 1000;
			window.setTimeout(this.gRef + ".scroll()", this.y.minRes);
		}
	}
}

// jump to an arbitrary position in two dimensions.
ypSimpleScroll.prototype.jumpTo = function(nx, ny) {
	if (this.loaded)
	{
		nx = Math.min(Math.max(nx, 0), this.scrollW);
		ny = Math.min(Math.max(ny, 0), this.scrollH);
		this.scrollLeft = nx;
		this.scrollTop = ny;
		if (this.y.ns4)this.content.moveTo(-nx, -ny);
		else {
			this.content.style.left = -nx + "px";
			this.content.style.top = -ny + "px";
		}
	}
}



// =========================================================================
// =============================== private =================================
// =========================================================================

ypSimpleScroll.minRes = 10;
ypSimpleScroll.ie  = document.all ? 1 : 0;
ypSimpleScroll.ns4 = document.layers ? 1 : 0;
ypSimpleScroll.dom = document.getElementById ? 1 : 0;
ypSimpleScroll.mac = navigator.platform == "MacPPC";
ypSimpleScroll.mo5 = document.getElementById && !document.all ? 1 : 0;

// recursively calls itself to animate
ypSimpleScroll.prototype.scroll = function() {
	this.aniTimer = window.setTimeout(this.gRef + ".scroll()", this.y.minRes);
	var nt = (new Date()).getTime();
	var d = Math.round((nt - this.lastTime) / 1000 * this.speed);
	if (d > 0)
	{
		var nx = d * this.fx + this.scrollLeft;
		var ny = d * this.fy + this.scrollTop;

		var xOut = (nx >= this.scrollLeft && nx >= this.stopH) || (nx <= this.scrollLeft && nx <= this.stopH);
		var yOut = (ny >= this.scrollTop && ny >= this.stopV)  || (ny <= this.scrollTop && ny <= this.stopV);
		//window.status = nx + " " + this.fx + " " + this.scrollLeft + " " + this.stopH + " | " + ny + " " + this.fy + " " + this.scrollTop + " " + this.stopV + " : " + d;
		if (nt - this.lastTime != 0 &&
			((this.fx == 0 && this.fy == 0) ||
			 (this.fy == 0 && xOut) ||
			 (this.fx == 0 && yOut) ||
			 (this.fx != 0 && this.fy != 0 && xOut && yOut)))
		{
			this.jumpTo(this.stopH, this.stopV);
			this.endScroll();
		}
		else {
			this.jumpTo(nx, ny);
			this.lastTime = nt;
		}
	}
}

// constructor
function ypSimpleScroll(id, left, top, width, height, speed, contentWidth, initLeft, initTop)
{
	var y = this.y = ypSimpleScroll;
	if (!initLeft)     initLeft     = 0;
	if (!initTop)      initTop      = 0;
	if (!contentWidth) contentWidth = width;

	// fix for netscape4 first-page bug.
	if (document.layers && !y.ns4) history.go(0);

	if (y.ie || y.ns4 || y.dom) {
		this.loaded		= false;
		this.id			= id;
		this.origSpeed	= speed;
		this.aniTimer	= false;
		this.op			= "";
		this.lastTime	= 0;
		this.clipH		= height;
		this.clipW		= width;
		this.scrollTop	= initTop;
		this.scrollLeft	= initLeft;

		// global reference to this object
		this.gRef = "ypSimpleScroll_"+id;
		eval(this.gRef+"=this");

		var d = document;
		d.write('<style type="text/css">');
		d.write('#' + this.id + 'Container { left:' + left + 'px; top:' + top + 'px; width:' + width + 'px; height:' + height + 'px; clip:rect(0 ' + width + ' ' + height + ' 0); overflow:hidden; }');
		d.write('#' + this.id + 'Container, #' + this.id + 'Content { position:relative; }');
		d.write('#' + this.id + 'Content { left:' + (-initLeft) + 'px; top:' + (-initTop) + 'px; width:' + contentWidth + 'px; }');
		d.write('</style>');
	}
}

// once the nceesary objects are present in the DOM, this gathers some info about them.
ypSimpleScroll.prototype.load = function() {
	var d, lyrId1, lyrId2;

	d = document;
	lyrId1 = this.id + "Container";
	lyrId2 = this.id + "Content";

	this.container	= this.y.dom ? d.getElementById(lyrId1) : this.y.ie ? d.all[lyrId1] : d.layers[lyrId1];
	this.content	= obj2 = this.y.ns4 ? this.container.layers[lyrId2] : this.y.ie ? d.all[lyrId2] : d.getElementById(lyrId2);
	this.docH		= Math.max(this.y.ns4 ? this.content.document.height : this.content.offsetHeight, this.clipH);
	this.docW		= Math.max(this.y.ns4 ? this.content.document.width  : this.content.offsetWidth,  this.clipW);
	this.scrollH	= this.docH - this.clipH;
	this.scrollW	= this.docW - this.clipW;
	this.loaded		= true;
	this.scrollLeft = Math.max(Math.min(this.scrollLeft, this.scrollW),0);
	this.scrollTop  = Math.max(Math.min(this.scrollTop, this.scrollH),0);
	this.jumpTo(this.scrollLeft, this.scrollTop);
}

function initializeTest() {
test.load();
}

jq(initializeTest);