function hideDivs(Index)
{
    var divNum
	var arr = document.getElementsByTagName('span')
    divNum = arr.length - Index;
		for(var i=0; i<arr.length;i++)
			{
			if(i != divNum)
				{
				arr[i].style.display = 'none';
				}
			if(i == divNum)
				{
				if(arr[i].style.display =='block')
					{
					arr[i].style.display = 'none'
					}
				else
					{
					arr[i].style.display = 'block';
					}
				}
		}
	}