var refSlider = function()
{
  if (typeof( index ) == 'undefined')
  {  
  var index = 0;
  }
	this.refSliderElem = null;
	this.imageLinks = new Array();
	
	
	// init
	this.init = function()
	{
		
		this.refSliderElem = document.getElementById('refSlider');
		this.imageLinks = this.refSliderElem.getElementsByTagName('div')[1].getElementsByTagName('a');
		
		//zeigt nur die ersten 4 Bilder an
		for (i=0; i<5; i++) {
			this.imageLinks[i].style.display = 'block';
		}
		for (i=5; i<this.imageLinks.length; i++) {
			this.imageLinks[i].style.display = 'none';
		}
			
	
		// slidingNav prev - Event
		this.refSliderElem.getElementsByTagName('a')[0].onclick = new Function('app.refSlider.prevElem()');
		
		// slidingNav prev - Event
		arrLength = this.refSliderElem.getElementsByTagName('a').length;
		this.refSliderElem.getElementsByTagName('a')[arrLength-1].onclick = new Function('app.refSlider.nextElem()');
	}
	
	
	
	
	
	this.prevElem = function() {
		if (index>0) {
			this.imageLinks[index-1].style.display = 'block';
			this.imageLinks[index+4].style.display = 'none';
			index -=1;
		}
	}
	
	this.nextElem = function() {
    	if (index+5 < this.imageLinks.length) {
			this.imageLinks[index].style.display = 'none';
			this.imageLinks[index+5].style.display = 'block';
		index +=1;
		}		
	}
}