var useBSNns;
if (useBSNns) {
if (typeof(bsn) == "undefined")
		  bsn = {};
	   var _bsn = bsn;
} else {
	  var _bsn = this;
      }

_bsn.Crossfader = function (divs, fadetime, delay ) {	
	 this.nAct = -1;
     	 this.aDivs = divs;
     
     		 for (var i=0;i<divs.length;i++) {
     	   document.getElementById(divs[i]).style.opacity = 0;
          	document.getElementById(divs[i]).style.position = "absolute";
    	   document.getElementById(divs[i]).style.filter = "alpha(opacity=0)";
            	  document.getElementById(divs[i]).style.visibility = "hidden";
      	 }
        	 this.nDur = fadetime;
               this.nDelay = delay;
                 this._newfade();
                 };
_bsn.Crossfader.prototype._newfade = function() {
  if (this.nID1)
      clearInterval(this.nID1);
      	   this.nOldAct = this.nAct;
               this.nAct++;
               
                	if (!this.aDivs[this.nAct])	this.nAct = 0;
    if (this.nAct == this.nOldAct)
        return false;
        
          document.getElementById( this.aDivs[this.nAct] ).style.visibility = "visible";
    this.nInt = 50;
    this.nTime = 0;
    var p=this;
    this.nID2 = setInterval(function() { p._fade() }, this.nInt);
    }
    
    _bsn.Crossfader.prototype._fade = function() {
  this.nTime += this.nInt;
   	var ieop = Math.round( this._easeInOut(this.nTime, 0, 1, this.nDur) * 100 );
     	var op = ieop / 100;
         	document.getElementById( this.aDivs[this.nAct] ).style.opacity = op;
             	document.getElementById( this.aDivs[this.nAct] ).style.filter = "alpha(opacity="+ieop+")";
                
                  if (this.nOldAct > -1) {
      document.getElementById( this.aDivs[this.nOldAct] ).style.opacity = 1 - op;
        		document.getElementById( this.aDivs[this.nOldAct] ).style.filter = "alpha(opacity="+(100 - ieop)+")";
                	 }
                     	
                        	 if (this.nTime == this.nDur) {
     		  clearInterval( this.nID2 );
              		
                      if (this.nOldAct > -1)
                      	   document.getElementById( this.aDivs[this.nOldAct] ).style.visibility = "hidden";	
                               var p=this;
                                   this.nID1 = setInterval(function() { p._newfade() }, this.nDelay);
                                     }
                                     }
                                     
                                     _bsn.Crossfader.prototype._easeInOut = function(t,b,c,d) {
                                       return c/2 * (1 - Math.cos(Math.PI*t/d)) + b;
                                       }