/* RR Scroll Javascript
   www.youngpup.net

   Version:
   1.0 - 3 November 2001

   Dependencies:
   none
*/

// Scroll layer
Scroll.prototype.up = function() { this.startScroll(90); }
Scroll.prototype.down = function() { this.startScroll(270); }
Scroll.prototype.left = function() { this.startScroll(180); }
Scroll.prototype.right = function() { this.startScroll(0); }

Scroll.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);
	}
}

Scroll.prototype.endScroll = function() {
	if (this.loaded) {
		window.clearTimeout(this.aniTimer);
		this.aniTimer = 0;
		this.speed = this.origSpeed;
        
        // Store cookie if required
        if (this.cookie) {
            
            // Write cookie
            if (typeof(cookieWrite) == 'function') {
                scrollLeft = this.content.style.left;
                scrollLeft = scrollLeft.replace('px','');
                scrollTop = this.content.style.top;
                scrollTop = scrollTop.replace('px','');                    
                cookieWrite('rr[' + this.id + 'scrollinitx]', scrollLeft, stageExpire, '/');
                cookieWrite('rr[' + this.id + 'scrollinity]', scrollTop, stageExpire, '/');
            }
        }
	}
}

Scroll.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;
	}
}

Scroll.prototype.overrideScrollSpeed = function(speed) {
	if (this.loaded) this.speed = speed;
}

Scroll.prototype.scrollToTag = function(id, left, top) {
    
    destinationLink = document.getElementById(id);
    if (!destinationLink) return 1;

    // Find the destination's position
    var destx = destinationLink.offsetLeft; 
    var desty = destinationLink.offsetTop;
    var thisNode = destinationLink;
    while (thisNode.offsetParent && 
          (thisNode.offsetParent != document.body)) {
      thisNode = thisNode.offsetParent;
      destx += thisNode.offsetLeft;
      desty += thisNode.offsetTop;
    }
    
    this.smleft = left;
    this.smtop = top;
    desty = desty - this.smoffset - this.smtop;  
    scrollTop = this.content.style.top;
    scrollTop = scrollTop.replace('px','');
    //stepsize = parseInt((desty-scrollTop)/this.smsteps);
    stepsize = 1;
    
    //this.scrollTo(0,desty,stepsize);
    this.jumpTo(0,desty);
    
    return 0;
}

Scroll.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);
		}
	}
}

Scroll.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";
		}
	}
}

// General settings
Scroll.cookie = false;
Scroll.minRes = 10;

// Smooth scroll to tag settings
Scroll.prototype.smsteps = 5;
Scroll.prototype.smoffset = 0;
Scroll.prototype.smleft = 0; 
Scroll.prototype.smtop = 0; 

// Browser settings
Scroll.ie = document.all ? 1 : 0;
Scroll.ns4 = document.layers ? 1 : 0;
Scroll.dom = document.getElementById ? 1 : 0;
Scroll.mac = navigator.platform == "MacPPC";
Scroll.mo5 = document.getElementById && !document.all ? 1 : 0;

Scroll.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);
		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;
		}
	}
}

Scroll.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 Scroll(id, left, top, width, height, speed, contentWidth, initLeft, initTop)
{
    var y = this.y = Scroll;
    if (!initLeft) initLeft = 0;
    if (!initTop) initTop = 0;
    if (!contentWidth) contentWidth = width;
    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;
        this.gRef = "scroll_"+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:absolute; }')
        d.write('#' + this.id + 'Wrapper { position:absolute }');
        d.write('#' + this.id + 'Container { position:absolute }');
        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 + 'Content { position:absolute }');
        d.write('#' + this.id + 'Content { left:' + (-initLeft) + 'px; top:' + (-initTop) + 'px; width:' + contentWidth + 'px; }');
        d.write('</style>');
    }
}