// Dynamic Layer Object
// sophisticated layer/element targeting and animation object which provides the core functionality needed in most DHTML applications
// 19990604

// Copyright (C) 1999 Dan Steinman
// Distributed under the terms of the GNU Library General Public License
// Available at http://www.dansteinman.com/dynapi/

function DynLayer(id,nestref,frame) {
	if (!is.ns5 && !DynLayer.set && !frame) DynLayerInit()
	this.frame = frame || self;
	if (is.ns) {
		if (is.ns4) {
			if (!frame) {
				if (!nestref) var nestref = DynLayer.nestRefArray[id];
				if (!DynLayerTest(id,nestref)) return;
				this.css = (nestref)? eval("document."+nestref+".document."+id) : document.layers[id];
			}
			else this.css = (nestref)? eval("frame.document."+nestref+".document."+id) : frame.document.layers[id];
			this.elm = this.event = this.css;
			this.doc = this.css.document;
		}
		else if (is.ns5) {
			this.elm = document.getElementById(id);
			this.css = this.elm.style;
			this.doc = document;
		}
		this.x = this.css.left;
		this.y = this.css.top;
		this.w = this.css.clip.width;
		this.h = this.css.clip.height;
	}
	else if (is.ie) {
		this.elm = this.event = this.frame.document.all[id];
		this.css = this.frame.document.all[id].style;
		this.doc = document;
		this.x = this.elm.offsetLeft;
		this.y = this.elm.offsetTop;
		this.w = (is.ie4)? this.css.pixelWidth : this.elm.offsetWidth;
		this.h = (is.ie4)? this.css.pixelHeight : this.elm.offsetHeight;
	}
	this.id = id;
	this.nestref = nestref;
	this.obj = id + "DynLayer";
	eval(this.obj + "=this");
}
function DynLayerMoveTo(x,y) {
	if (x!=null) {
		this.x = x;
		if (is.ns) this.css.left = this.x;
		else this.css.pixelLeft = this.x;
	}
	if (y!=null) {
		this.y = y;
		if (is.ns) this.css.top = this.y;
		else this.css.pixelTop = this.y;
	}
}
function DynLayerMoveBy(x,y) {
	this.moveTo(this.x+x,this.y+y);
}
function DynLayerShow() {
	this.css.visibility = (is.ns4)? "show" : "visible";
}
function DynLayerHide() {
	this.css.visibility = (is.ns4)? "hide" : "hidden";
}
DynLayer.prototype.moveTo = DynLayerMoveTo;
DynLayer.prototype.moveBy = DynLayerMoveBy;
DynLayer.prototype.show = DynLayerShow;
DynLayer.prototype.hide = DynLayerHide;
DynLayerTest = new Function('return true');

// DynLayerInit Function
function DynLayerInit(nestref) {
	if (!DynLayer.set) DynLayer.set = true;
	if (is.ns) {
		if (nestref) ref = eval('document.'+nestref+'.document');
		else {nestref = ''; ref = document;};
		for (var i=0; i<ref.layers.length; i++) {
			var divname = ref.layers[i].name;
			DynLayer.nestRefArray[divname] = nestref;
			var index = divname.indexOf("Div");
			if (index > 0) {
				eval(divname.substr(0,index)+' = new DynLayer("'+divname+'","'+nestref+'")');
			}
			if (ref.layers[i].document.layers.length > 0) {
				DynLayer.refArray[DynLayer.refArray.length] = (nestref=='')? ref.layers[i].name : nestref+'.document.'+ref.layers[i].name;
			}
		}
		if (DynLayer.refArray.i < DynLayer.refArray.length) {
			DynLayerInit(DynLayer.refArray[DynLayer.refArray.i++]);
		}
	}
	else if (is.ie) {
		for (var i=0; i<document.all.tags("DIV").length; i++) {
			var divname = document.all.tags("DIV")[i].id;
			var index = divname.indexOf("Div");
			if (index > 0) {
				eval(divname.substr(0,index)+' = new DynLayer("'+divname+'")');
			}
		}
	}
	return true;
}
DynLayer.nestRefArray = new Array();
DynLayer.refArray = new Array();
DynLayer.refArray.i = 0;
DynLayer.set = false;

// Slide Methods
function DynLayerSlideTo(endx,endy,inc,speed,fn) {
	if (endx==null) endx = this.x;
	if (endy==null) endy = this.y;
	var distx = endx-this.x;
	var disty = endy-this.y;
	this.slideStart(endx,endy,distx,disty,inc,speed,fn);
}
function DynLayerSlideBy(distx,disty,inc,speed,fn) {
	var endx = this.x + distx;
	var endy = this.y + disty;
	this.slideStart(endx,endy,distx,disty,inc,speed,fn);
}
function DynLayerSlideStart(endx,endy,distx,disty,inc,speed,fn) {
	if (this.slideActive) return;
	if (!inc) inc = 10;
	if (!speed) speed = 20;
	var num = Math.sqrt(Math.pow(distx,2) + Math.pow(disty,2))/inc;
	if (num==0) return;
	var dx = distx/num;
	var dy = disty/num;
	if (!fn) fn = null;
	this.slideActive = true;
	this.slide(dx,dy,endx,endy,num,1,speed,fn);
}
function DynLayerSlide(dx,dy,endx,endy,num,i,speed,fn) {
	if (!this.slideActive) return;
	if (i++ < num) {
		this.moveBy(dx,dy);
		this.onSlide();
		if (this.slideActive) setTimeout(this.obj+".slide("+dx+","+dy+","+endx+","+endy+","+num+","+i+","+speed+",\""+fn+"\")",speed);
		else this.onSlideEnd();
	}
	else {
		this.slideActive = false;
		this.moveTo(endx,endy);
		this.onSlide();
		this.onSlideEnd();
		eval(fn);
	}
}
function DynLayerSlideInit() {}
DynLayer.prototype.slideInit = DynLayerSlideInit;
DynLayer.prototype.slideTo = DynLayerSlideTo;
DynLayer.prototype.slideBy = DynLayerSlideBy;
DynLayer.prototype.slideStart = DynLayerSlideStart;
DynLayer.prototype.slide = DynLayerSlide;
DynLayer.prototype.onSlide = new Function();
DynLayer.prototype.onSlideEnd = new Function();

// Clip Methods
function DynLayerClipInit(clipTop,clipRight,clipBottom,clipLeft) {
	if (is.ie) {
		if (arguments.length==4) this.clipTo(clipTop,clipRight,clipBottom,clipLeft);
		else if (is.ie4) this.clipTo(0,this.css.pixelWidth,this.css.pixelHeight,0);
	}
}
function DynLayerClipTo(t,r,b,l) {
	if (t==null) t = this.clipValues('t');
	if (r==null) r = this.clipValues('r');
	if (b==null) b = this.clipValues('b');
	if (l==null) l = this.clipValues('l');
	if (is.ns) {
		this.css.clip.top = t;
		this.css.clip.right = r;
		this.css.clip.bottom = b;
		this.css.clip.left = l;
	}
	else if (is.ie) this.css.clip = "rect("+t+"px "+r+"px "+b+"px "+l+"px)";
}
function DynLayerClipBy(t,r,b,l) {
	this.clipTo(this.clipValues('t')+t,this.clipValues('r')+r,this.clipValues('b')+b,this.clipValues('l')+l);
}
function DynLayerClipValues(which) {
	if (is.ie) var clipv = this.css.clip.split("rect(")[1].split(")")[0].split("px");
	if (which=="t") return (is.ns)? this.css.clip.top : Number(clipv[0]);
	if (which=="r") return (is.ns)? this.css.clip.right : Number(clipv[1]);
	if (which=="b") return (is.ns)? this.css.clip.bottom : Number(clipv[2]);
	if (which=="l") return (is.ns)? this.css.clip.left : Number(clipv[3]);
}
DynLayer.prototype.clipInit = DynLayerClipInit;
DynLayer.prototype.clipTo = DynLayerClipTo;
DynLayer.prototype.clipBy = DynLayerClipBy;
DynLayer.prototype.clipValues = DynLayerClipValues;

// Write Method
function DynLayerWrite(html) {
	if (is.ns) {
		this.doc.open();
		this.doc.write(html);
		this.doc.close();
	}
	else if (is.ie) {
		this.event.innerHTML = html;
	}
}
DynLayer.prototype.write = DynLayerWrite;

// BrowserCheck Object
function BrowserCheck() {
	var b = navigator.appName;
	if (b=="Netscape") this.b = "ns";
	else if (b=="Microsoft Internet Explorer") this.b = "ie";
	else this.b = b;
	this.version = navigator.appVersion;
	this.v = parseInt(this.version);
	this.ns = (this.b=="ns" && this.v>=4);
	this.ns4 = (this.b=="ns" && this.v==4);
	this.ns5 = (this.b=="ns" && this.v==5);
	this.ie = (this.b=="ie" && this.v>=4);
	this.ie4 = (this.version.indexOf('MSIE 4')>0);
	this.ie5 = (this.version.indexOf('MSIE 5')>0);
	this.min = (this.ns||this.ie);
}
is = new BrowserCheck();

// CSS Function
function css(id,left,top,width,height,color,vis,z,other) {
	if (id=="START") return '<STYLE TYPE="text/css">\n';
	else if (id=="END") return '</STYLE>';
	var str = (left!=null && top!=null)? '#'+id+' {position:absolute; left:'+left+'px; top:'+top+'px;' : '#'+id+' {position:relative;';
	if (arguments.length>=4 && width!=null) str += ' width:'+width+'px;';
	if (arguments.length>=5 && height!=null) {
		str += ' height:'+height+'px;';
		if (arguments.length<9 || other.indexOf('clip')==-1) str += ' clip:rect(0px '+width+'px '+height+'px 0px);';
	}
	if (arguments.length>=6 && color!=null) str += (is.ns)? ' layer-background-color:'+color+';' : ' background-color:'+color+';';
	if (arguments.length>=7 && vis!=null) str += ' visibility:'+vis+';';
	if (arguments.length>=8 && z!=null) str += ' z-index:'+z+';';
	if (arguments.length==9 && other!=null) str += ' '+other;
	str += '}\n';
	return str;
}
function writeCSS(str,showAlert) {
	str = css('START')+str+css('END');
	document.write(str);
	if (showAlert) alert(str);
}