function getElementsByName_iefix(tag, name) {
     
     var elem = document.getElementsByTagName(tag);
     var arr = new Array();
     for(i = 0,iarr = 0; i < elem.length; i++) {
          att = elem[i].getAttribute("name");
          if(att == name) {
               arr[iarr] = elem[i];
               iarr++;
          }
     }
     return arr;
}

function Next(){
	var boxes = getElementsByName_iefix('div','boxSale');
	var ile = boxes.length-1;
	if (boxes[ile].style.display != 'block') {
		while (boxes[ile].style.display != 'block') 
			ile--;
		
		boxes[ile - 2].style.display = 'none';
		boxes[ile + 1].style.display = 'block';
		
		if (ile +2 >= boxes.length)
			document.getElementById('arrowNext').src = '/var/img/arrow_next.png';
		else 
			document.getElementById('arrowNext').src = '/var/img/arrow_next_active.png';
			
		if (boxes[0].style.display != 'block') 
			document.getElementById('arrowPrev').src = '/var/img/arrow_prev_active.png';
		else 
			document.getElementById('arrowPrev').src = '/var/img/arrow_prev.png';
		
		
	}
	
	
}

function Prev(){
	
	var boxes = getElementsByName_iefix('div','boxSale');
	var i = 1;
	
	if (boxes[0].style.display != 'block') {
		//alert(i + ' ' + boxes[i+2].style.display);
		while (boxes[i].style.display != 'block') 
			i++;
		boxes[i + 2].style.display = 'none';
		
		boxes[i - 1].style.display = 'block';
	
		if (i +2 >= boxes.length)
			document.getElementById('arrowNext').src = '/var/img/arrow_next.png';
		else 
			document.getElementById('arrowNext').src = '/var/img/arrow_next_active.png';
			
		if (boxes[0].style.display != 'block') 
			document.getElementById('arrowPrev').src = '/var/img/arrow_prev_active.png';
		else 
			document.getElementById('arrowPrev').src = '/var/img/arrow_prev.png';
	}
	
}