function XVis(group,xgroup,cgroup)
	{
	if (document.getElementById(group).style.display == 'none' )
		{
		document.getElementById(group).style.display = "block" ;
		document.getElementById(xgroup).style.display = "none" ;
		document.getElementById(cgroup).style.display = "" ;
		}
	else
		{
		document.getElementById(group).style.display = "none" ; 
		document.getElementById(xgroup).style.display = "" ;
		document.getElementById(cgroup).style.display = "none" ;
		}
	return ;

	}