var sidemenu = new Array('cont1','cont2','cont3','cont4');

function hideall(group) {
	for (var i=0; i<group.length; i++) {
    	hide(group[i]);
    	}
	}

function show(which) {
if (document.getElementById(which).style.display=="none") {
	hideall(sidemenu);
    //$("#"+which).slideDown(300);
    Effect.BlindDown(which, { duration: 0.3 });

    } else hideall(sidemenu);
	}
    
function hide(which) {
	if (document.getElementById(which).style.display!="none") Effect.BlindUp(which, { duration: 0.3 });
	}