//#######################################
//#####  Michael BŸrge   24.11.99   #####
//#######################################


ns4 = (document.layers)? true:false;
ie4 = (document.all)? true:false;

//##### Layer-Object-Constructor
function LayerObj(id,nest,frame) {
	if (ns4) {
		this.css=(nest)? eval('document.'+nest+'.document.layers[id]'):document.layers[id]	
		this.x=this.css.left
		this.y=this.css.top
		this.doc=this.css.document
		this.elm=this.css
	}
	else if (ie4) {
		this.css=document.all[id].style
		this.elm=document.all[id] 
		this.x=this.elm.offsetLeft
		this.y=this.elm.offsetTop
		this.doc=document
	}
	this.obj=id.slice(0,id.indexOf('Div'));
//	this.obj=id+'DYNSCRIPT'
//	eval(this.obj+'=this')

	this.show=DYNSCRIPTshow
	this.hide=DYNSCRIPThide

	this.moveTo=DYNSCRIPTmoveTo
	this.moveBy=DYNSCRIPTmoveBy
	this.slideTo=DYNSCRIPTslideTo
	this.slideBy=DYNSCRIPTslideBy
	this.doSlide=doSlide
	this.circleSlideBy=circleSlideBy
	this.doCircleSlide=doCircleSlide

	this.setBg=DYNSCRIPTsetBg
	this.write=write

	this.addit=addit
}


function addit(method,methodname) {
	if (!methodname) eval('this.'+method+'='+method)
	else eval('this.'+method+'='+methodname)
}

//##### show/hide Methods
function DYNSCRIPTshow() {this.css.visibility=(ns4)? 'show':'visible'}
function DYNSCRIPThide() {this.css.visibility=(ns4)? 'hide':'hidden'}

//##### Move Methods
function DYNSCRIPTmoveTo(x,y) {
	this.x=x
	this.y=y
	this.css.left=this.x
	this.css.top=this.y
}
function DYNSCRIPTmoveBy(x,y) {this.moveTo(this.x+x,this.y+y)}

//##### Color Handling #####
//##########################
function DYNSCRIPTsetBg(color) {
	if (ie4) this.css.backgroundColor=color
	else if (ns4) this.doc.bgColor=color
}


//##### Slide Methods #####
//#########################

//## linear slide
function DYNSCRIPTslideTo(x,y,step,speed,action) {
	if (this.slide) {
		clearTimeout(this.slide.time);
		this.slide=null;
	}
	if (!step) step=10;       //SchrittlŠnge
	if (!speed) speed=10;
	var Ax=this.x;            //Ausgangspunkt A
	var Ay=this.y;
	var Bx=x 	                //Zielpunkt B
	var By=y
	var ABx=Bx-Ax;            //Verbindungsvektor AB
	var ABy=By-Ay;
	var bAB=Math.sqrt(Math.pow(ABx,2)+Math.pow(ABy,2)) //Betrag von AB
	var eABx=ABx/bAB;         //Einheitsvektor von sd
	var eABy=ABy/bAB;
	var steps=Math.round(bAB/step); 	//Anzahl Schritte
	var dABx=eABx*bAB/steps;  //Verschiebungsvektor
	var dABy=eABy*bAB/steps;
	this.slide=new SlideObj(dABx,dABy,steps,speed,action);
	this.doSlide();
}
function DYNSCRIPTslideBy(x,y,step,speed,action) {
	this.slideTo(this.x+x,this.y+y,step,speed,action)
}
function SlideObj(dABx,dABy,steps,speed,action) {
	this.dx=dABx;
	this.dy=dABy;
	this.steps=steps;
	this.done=0;	
	this.speed=speed;
	this.time=0;
	this.action=action;
}
function doSlide() {
	if (this.slide.done<this.slide.steps) {
		this.slide.done+=1;	
		this.moveBy(this.slide.dx,this.slide.dy);
		this.slide.time=setTimeout(this.obj+'.doSlide()',this.slide.speed);
	}
	else {
		var temp=this.slide.action;
		this.slide=null;
		eval(temp);
	}
}

//## slide following a circle

function circleSlideBy(angle,centerX,centerY,action,step,speed) {
	if (this.slide) {
		clearTimeout(this.slide.time);
		this.slide=null;
	}
	if (!step) step=10;
	if (!speed) speed=10;
	var dX=this.x-centerX;
	var dY=-(this.y-centerY);
	var actangle=Math.atan2(dY,dX)    //aktueller Winkel
	if (actangle<0) actangle+=2*Math.PI;
	var radius=Math.sqrt(Math.pow(dX,2)+Math.pow(dY,2));
	var steps=Math.round(radius*angle/step);
	if (steps<0) steps*=-1;   //angle kann negativ sein
	var dangle=angle/steps;
	this.slide=new CircleSlideObj(dangle,actangle,centerX,centerY,radius,steps,speed,action)
	this.doCircleSlide();
} 
function CircleSlideObj(dangle,actangle,centerX,centerY,radius,steps,speed,action) {
	this.dangle=dangle;
	this.actangle=actangle;
	this.centerX=centerX;
	this.centerY=centerY;
	this.radius=radius;
	this.steps=steps;
	this.done=0;
	this.speed=speed;
	this.time=0;
	this.action=action;
}
function doCircleSlide() {
	if (this.slide.done<this.slide.steps) {
		this.slide.done+=1;
		this.slide.actangle+=this.slide.dangle;
	this.moveTo(this.slide.centerX + this.slide.radius * Math.cos(this.slide.actangle),
this.slide.centerY - this.slide.radius * Math.sin(this.slide.actangle))
		this.slide.time=setTimeout(this.obj+'.doCircleSlide()',this.slide.speed)
	}
	else {
		var temp=this.slide.action;
		this.slide=null;
		eval(temp);
	}
}


//##### Writing to a Layer #####
//##############################
function write(code) {
		if (ns4) {
			this.doc.open();
			this.doc.write(code);
			this.doc.close();
	}
	else if (ie4) this.doc.innerHTML=code;
}


//##### DEBUG ##################
//##############################
var codecode;

function debug() {
	document.onkeydown=keyDown
	if (document.layers) document.captureEvents(Event.KEYDOWN)
}

function evaluate() {
	codecode=prompt("Code to evaluate:",codecode)
	eval(codecode);
}

function keyDown(e) {
	if (ns4) {var nKey=e.which; var ieKey=0}
	if (ie4) {var nKey=0; var ieKey=event.keyCode}
	if (nKey==100 || ieKey==68) evaluate();
}