function ddown(ly)
	{ 
 	i=1;
    	while (document.getElementById("ly"+i))
 	{
	document.getElementById("ly"+i).style.display='none';
	i++;
	}
 	document.getElementById(ly).style.display='block'; 
	}

function dhide(ly)
	{
	document.getElementById(ly).style.display='none'; 	
	}