function showhide(id,id1){
	document.getElementById('a1').className="";
	document.getElementById('a2').className="";
	document.getElementById('a3').className="";
	document.getElementById('a4').className="";
	document.getElementById('a5').className="";
	document.getElementById(id1).className="current";
	document.getElementById('Hale magazynowe').style.display ='none';
	document.getElementById('Hale produkcyjne').style.display ='none';
	document.getElementById('Hale namiotowe').style.display ='none';
	document.getElementById('Hale imprezowe').style.display ='none';
	document.getElementById('Hale sportowe').style.display ='none';	
	document.getElementById('Namioty handlowe').style.display ='none';	
	document.getElementById('Namioty magazynowe').style.display ='none';	
	document.getElementById('Namioty sportowe').style.display ='none';	
	document.getElementById(id).style.display ='block';
}