function show(table)
	{
	 document.getElementById(table).style.display="block";
	 button_up='up_'+table;
	 button_down='down_'+table;
	 document.getElementById(button_up).style.display="block";
	 document.getElementById(button_up).style.visibility="visible";
	 document.getElementById(button_down).style.display="none";
	 document.getElementById(button_down).style.visibility="hidden";
	}
    
function hide(table)
	{
	 document.getElementById(table).style.display="none";
	 button_up='up_'+table;
	 button_down='down_'+table;
	 document.getElementById(button_up).style.display="none";
	 document.getElementById(button_up).style.visibility="hidden";
	 document.getElementById(button_down).style.display="block";
	 document.getElementById(button_down).style.visibility="visible";
	}