function active(el, img){
	el.src = img;
}
function goTo(adr){
	document.location.href = adr;
	return false;
}
function goTo_download(plik){
	document.location.href = 'download.php?opcja=save&plik='+plik;
	return false;
} 
function chowaj(tab){
	for(var z = 0; z < tab.length; z++){
		tab[z].style.display = 'none';
		tab[z].style.display = '';
	}
}

function getElementsByClass(classs, tag)  
{  

if (!tag)  
{  
tag = "*";  
}  
 
var elementsByTag = document.getElementsByTagName(tag);  
var classItems = new Array()  
  
for (var i = 0; i < elementsByTag.length; i++)  
{  

var currentItem = elementsByTag[i];  

if (currentItem.className == classs)  
{  
	currentItem.style.display = 'none';
classItems.push(currentItem);  
}  
}
 chowaj(classItems); 
}