// 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)

}