/*  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(c,d){this.fDur=1;this.delay=5;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="img'+i+'" alt="" />'+"\n";this._g('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('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;};