var rollFlag=0;

	function txt_roll(str)
	{
		sub_num = str.substring(str.length - 2);
		sub_str = str.substring(0, str.length -2);
	
		if (document.all[str].style.display=="")
		{
			document.all[str].style.display="none";
			rollFlag=0;
			return;
		}
		else
			{
			if(rollFlag != 0)
			{
				document.all[sub_str+rollFlag].style.display="none";
				document.all[str].style.display="";
			}
		
			document.all[str].style.display="";
			rollFlag=sub_num;
		}
		
	}