function showNext(trida, mod){
	//alert(trida);
	var elements = document.getElementsByTagName("div");
	for(i=0; i<elements.length; i++){
		if(mod=='sub'){
      if(elements[i].className=='aktual' || elements[i].className=='next' || elements[i].className=='next2'){
  			elements[i].style.display='none';
  		}
  	} else {
      if(elements[i].className=='tab_first' || elements[i].className=='tab_second' || elements[i].className=='tab_third'){
  			elements[i].style.display='none';
  		}
    }
		if(elements[i].className==trida){
			elements[i].style.display='block';
		}
	}
	//alert(elements.length);
}

function changeClass(element, mod){
//	alert(element.className);
  if(mod=='sub'){
  	var elements = document.getElementsByTagName("a");
  	for(i=0; i<elements.length; i++){
  		if(elements[i].className=='link-sub' || elements[i].className=='link-sub active'){
  			elements[i].className = 'link-sub';	
  		}	  		
  		if (elements[i].className=='link-sub-first active' || elements[i].className=='link-sub-first'){
        elements[i].className = 'link-sub-first';
      }
  	}
  	element.className = 'link-sub active';
	} else {
    var elements = document.getElementsByTagName("a");
  	for(i=0; i<elements.length; i++){
  		if(elements[i].className=='link' || elements[i].className=='active'){
  			elements[i].className = 'link';
  		}
  	}
  	element.className = 'active';
  	var elements = document.getElementsByTagName("a");
  	for(i=0; i<elements.length; i++){
  		if(elements[i].className=='link-sub' || elements[i].className=='link-sub active'){
  			elements[i].className = 'link-sub';	
  		}	  		
  		if (elements[i].className=='link-sub-first active' || elements[i].className=='link-sub-first'){
        elements[i].className = 'link-sub-first';
      }
  	}
  	for(i=0; i<elements.length; i++){
  		if(elements[i].className=='link-sub-first active' || elements[i].className=='link-sub-first'){
  			elements[i].className = 'link-sub-first active';
  		}
  	}
  	
  }
}