/*  imgFader, version 1.0
 *  (c) 2008 Malte Sieb (http://www.maltesieb.de)
 *
 *  imgFader is freely distributable under the terms of the GPL license.
 *  For details, see my web site: http://www.maltesieb.org/skripte
 */
var Fade=function(sss,c,d){
		this.fDur=1;
		this.delay=5;
		this.sss=sss;
		this.imgs=new Array();
		this.mode='random';
		this.clear=true;
		for(var i in d)
			this[i]=d[i];
			if(this.fDur>this.delay) this.fDur=this.delay;
			this.ce=0;
			this.eo=1;
			this.po=0;
			this.fps=25;
			this.c=c;
			if(this.clear)this._g(this.c).innerHTML='';
			this._g(c).style.position='relative';
			for(i=0;i<this.imgs.length;i++){
					this._a(i,this.imgs[i]);
			} 
			this.start();
	    };
		Fade.prototype.start=function(){
				var p=this;this.stop();
				this.s=window.setInterval(function(){p._s()},this.delay*1000);
		};
		Fade.prototype.stop=function(){
				window.clearInterval(this.s);
		};
		Fade.prototype._a=function(i,img){
			this._g(this.c).innerHTML+='<img src="'+img+'" id="'+this.sss+'_img'+i+'" alt="" />'+"\n";this._g(this.sss+'_img'+i).style.position='absolute';
			this._so(i,(i==this.ce?this.eo:(i==this.pe?this.po:0)));
		};
		Fade.prototype._u=function(n){
				this.imgs=n;
				this._g(this.c).innerHTML='';
				for(i=0;i<n.length;i++){
					this._a(i,this.imgs[i]);
				}
		};
		Fade.prototype._g=function(i){
			return document.getElementById(i);
		};
		Fade.prototype._d=function(n){
			for(i=0;i<this.imgs.length;i++){
				if(n==this.imgs[i])return i;
			}return false;
		}
		Fade.prototype._so=function(i,o){
			var e=this._g(this.sss+'_img'+i);
			o=o>1?1:(o<0?0:o);
			e.style.opacity=o;
			e.style.filter="alpha(opacity="+(o*100)+")";
		};
		Fade.prototype._f=function(){
			if(this.eo>=1){
				window.clearInterval(this.f);
			}
			var d=1/(this.fps*this.fDur);
			this._so(this.pe,(this.po-=d));
			this._so(this.ce,(this.eo+=d));
		};
		Fade.prototype._s=function(ce){
			if(this.s){
				window.clearInterval(this.s);
				window.clearInterval(this.f);
			}
			for(i=0;i<this.imgs.length;i++){
				if(i!=this.ce&&i!=this.pe) this._so(i,0);
			}
			var p=this,r;
			if(this.imgs.length>0){
				this.pe=this.ce;
				if(ce||ce==0){
					this.ce=ce;
					this.fe=null;
				}else if(this.mode=='random'){
					do r=Math.round((Math.random()*this.imgs.length)-0.499);
					while(r==this.ce);
					this.ce=r;
				}else{
					if(++this.ce>(this.imgs.length-1)){
						this.ce=0;
					}
				}
				this.eo=0;
				this.po=1;
				this.f=window.setInterval(function(){p._f();
		},Math.round(this.fDur*1000/this.fps));
		}
		this.start();
		};
		Fade.prototype.add=function(img,d){
			var p,n=new Array();
			p=this._d(img);
			if(!p||d.force){
				if(d.pos&&d.pos=='first')d.pos=1;
				if(d.pos&&d.pos<=this.imgs.length){
					d.pos--;
					for(i=0;i<this.imgs.length;i++){
						if(i<d.pos)n[i]=this.imgs[i];
						else if(i==d.pos){
							n[i]=img;
							n[(i+1)]=this.imgs[i];
						}else n[(i+1)]=this.imgs[i];
					}
					if(this.ce>=d.pos){
						this.ce++;
					}
					if(this.pe>=d.pos){
						this.pe++;
					}
					this._u(n);
					p=d.pos;
				}else{
					this.imgs[this.imgs.length]=img;
					p=this.imgs.length-1;
					this._a(p,img);
				}
			}
			if(d.mode&&d.mode=='immediate'){
				this._s(p);
			}
		};
		Fade.prototype.go=function(p){
			if(typeof p=='string'&&p.indexOf('+')>-1){
				p=parseInt(p.substr(1))+this.ce+1;
				if(p>this.imgs.length)p=p-this.imgs.length;
			}else if(typeof p=='string'&&p.indexOf('-')>-1){
				p=this.ce-parseInt(p.substr(1))+1;
				if(p<=0)p=p+this.imgs.length;
			}this._s(parseInt(p)-1);
		};
Fade.prototype.preload=function(img){var i=new Image;i.src=img;};