/****************************************************************
"bretteleben.de Simple Picture Slideshow" Plugin for Joomla 1.5 - Version 1.1.0
License: http://www.gnu.org/copyleft/gpl.html
Author: Andreas Berger - http://www.bretteleben.de
Copyright (c) 2008 Andreas Berger - andreas_berger@bretteleben.de
Project page and Demo at http://www.bretteleben.de
***Last update: 2009-01-07***
*****************************************************************/
function besps_slideshow(besps_slideid,besps_ftim,besps_stim,besps_steps,besps_startwhen,besps_emax,besps_preload){

//declarations
	var self = this;
	var slideid=besps_slideid;
	var ftim=besps_ftim;
	var stim=besps_stim;
	var steps=besps_steps;
	var startwhen=besps_startwhen;
	var emax=besps_emax;
	var preload=besps_preload;
	var stopit=1;
	var startim=1;
	var u=0;
	var parr = new Array();
	var ptofade,pnext,factor,mytimeout;

//push images into array and get things going
	this.b_myfade = function(){
		var a,idakt,paktidakt,ie5exep;
		for(a=1;a<=emax;a++){
			idakt="img_"+slideid+"_"+a;paktidakt=document.getElementById(idakt);
    	ie5exep=new Array(paktidakt);parr=parr.concat(ie5exep);
    if(preload&&a==emax){
    	setTimeout(function(){self.b_preload();},10);
    }
    }
		if(startwhen){
			stopit=0;
 			mytimeout=setTimeout(function(){self.b_slide();},stim);
 		}
	}

//prepare current and next and trigger slide
	this.b_slide = function(){
		clearTimeout(mytimeout);
		u=0;
		ptofade=parr[startim-1];
		if(startim<emax){pnext=parr[startim];}
		else{pnext=parr[0];}
		pnext.style.zIndex=1;
		pnext.style.visibility="visible";
		pnext.style.filter="Alpha(Opacity=100)";
		pnext.style.MozOpacity=1;
		pnext.style.opacity=1;
		ptofade.style.zIndex=2;
		ptofade.style.visibility="visible";
		ptofade.style.filter="Alpha(Opacity=100)";
		ptofade.style.MozOpacity=1;
		ptofade.style.opacity=1;
		factor=100/steps;
		if(stopit=="0"){
			this.b_slidenow();
		}
	}

//one step forward
	this.b_forw = function(){
		stopit=1;
		clearTimeout(mytimeout);
		ptofade=parr[startim-1];
		if(startim<emax){pnext=parr[startim];startim=startim+1;}
		else{pnext=parr[0];startim=1;}
		ptofade.style.visibility="hidden";
		ptofade.style.zIndex=1;
		pnext.style.visibility="visible";
		pnext.style.zIndex=2;
		self.b_slide();
	}

//one step back
	this.b_back = function(){
		stopit=1;
		clearTimeout(mytimeout);
		if(u==0){ //between two slides
			ptofade=parr[startim-1];
			if(startim<emax){pnext=parr[startim];}
			else{pnext=parr[0];}
			pnext.style.visibility="hidden";
			ptofade.style.zIndex=1;
			ptofade.style.visibility="visible";
			if(startim>=2){startim=startim-1;}
			else{startim=emax;}
			self.b_slide();
		}
		else{ //whilst sliding
			self.b_slide();
		}
	}

//slide as said, then give back
	this.b_slidenow = function(){
		var check1,maxalpha,curralpha;
		check1=ptofade.style.MozOpacity;
		maxalpha=(100-factor*u)/100*105;
		if(check1<=maxalpha/100){u=u+1;}
		curralpha=100-factor*u;
		ptofade.style.filter="Alpha(Opacity="+curralpha+")";
		ptofade.style.MozOpacity=curralpha/100;
		ptofade.style.opacity=curralpha/100;
		if(u<steps){ //slide not finished
			if(stopit=="0"){mytimeout=setTimeout(function(){self.b_slidenow();},ftim);}
			else {this.b_slide();}
		}
		else{ //slide finished
			if(startim<emax){
				ptofade.style.visibility="hidden";
				ptofade.style.zIndex=1;
				pnext.style.zIndex=2;
				startim=startim+1;u=0;
				mytimeout=setTimeout(function(){self.b_slide();},stim);
			}
			else{
				ptofade.style.visibility="hidden";
				ptofade.style.zIndex=1;
				pnext.style.zIndex=2;
				startim=1;u=0;
				mytimeout=setTimeout(function(){self.b_slide();},stim);
			}
		}
	}

//manual start
	this.b_start= function(){
		if(stopit==1){
 			stopit=0;
 			mytimeout=setTimeout(function(){self.b_slide();},stim);
 		}
	}

//manual stop
	this.b_stop= function(){
		clearTimeout(mytimeout);
		stopit=1;
		this.b_slide();
	}

//preload
	this.b_preload= function(){
		var arrdelta,tempsrc,j;
		if(preload&&preload.length>=1){
			for (j=0;j<preload.length;j++){
				arrdelta=(emax-preload.length+j)*1;
				tempsrc=parr[arrdelta].getElementsByTagName("img")[0].src.toString();
				parr[arrdelta].getElementsByTagName("img")[0].src=tempsrc.replace(/plugins\/content\/plugin_besps\/besps.png$/g, "images\/stories\/"+preload[j]);
			}
		}
	}

//call autostart-function
	window.addEvent("load",this.b_myfade);
}