function switchMenu(obj) { 
var el = document.getElementById(obj); 
if ( el.style.display!= "none" ) { 
el.style.display = 'none'; 
} 
//else { 
//el.style.display = ''; 
//} 
} 

function show_hide(tblid, show)
{
		if (tbl = document.getElementById(tblid)) {
			if (null == show) show = tbl.style.display == 'none';
			tbl.style.display = (show ? '' : 'none');
		}
}