function show_dropDown(nb)
{
	var a=document.getElementById('fold'+nb);
	if(a.style.display=='')
	{
		a.style.display='none';
	}
	else
	{
		a.style.display='';
		switch (nb)
		{
			case "1":
				var c=document.getElementById('fold2');
				c.style.display='none';
				var c=document.getElementById('fold3');
				c.style.display='none';
				var c=document.getElementById('fold4');
				c.style.display='none';
				var c=document.getElementById('fold5');
				c.style.display='none';
				var c=document.getElementById('fold6');
				c.style.display='none';
			break;
			case "2":
				var c=document.getElementById('fold1');
				c.style.display='none';
				var c=document.getElementById('fold3');
				c.style.display='none';
				var c=document.getElementById('fold4');
				c.style.display='none';
				var c=document.getElementById('fold5');
				c.style.display='none';
				var c=document.getElementById('fold6');
				c.style.display='none';
			break;
			case "3":
				var c=document.getElementById('fold1');
				c.style.display='none';
				var c=document.getElementById('fold2');
				c.style.display='none';
				var c=document.getElementById('fold4');
				c.style.display='none';
				var c=document.getElementById('fold5');
				c.style.display='none';
				var c=document.getElementById('fold6');
				c.style.display='none';
			break;
			case "4":
				var c=document.getElementById('fold1');
				c.style.display='none';
				var c=document.getElementById('fold2');
				c.style.display='none';
				var c=document.getElementById('fold3');
				c.style.display='none';
				var c=document.getElementById('fold5');
				c.style.display='none';
				var c=document.getElementById('fold6');
				c.style.display='none';
			break;
			case "5":
				var c=document.getElementById('fold1');
				c.style.display='none';
				var c=document.getElementById('fold2');
				c.style.display='none';
				var c=document.getElementById('fold3');
				c.style.display='none';
				var c=document.getElementById('fold4');
				c.style.display='none';
				var c=document.getElementById('fold6');
				c.style.display='none';
			break;
			case "6":
				var c=document.getElementById('fold1');
				c.style.display='none';
				var c=document.getElementById('fold2');
				c.style.display='none';
				var c=document.getElementById('fold3');
				c.style.display='none';
				var c=document.getElementById('fold4');
				c.style.display='none';
				var c=document.getElementById('fold5');
				c.style.display='none';
			break;
		}
	}
}