var offon="off";
function link_open(now,ww){
var wb =eval("document.getElementById('"+ww+"')");
if(wb.style.display.value='none' && offon=='off')
	{
	wb.style.display='block';
	offon=now;
	}
else
	{
	wb.style.display='none';
	offon="off";
	}
}