function list1showhide(a){
	var tgtElm=document.getElementById("ul"+a.id.substr(1));
	if (tgtElm.style.display=="none") {
		tgtElm.style.display="block";
		a.innerHTML="⊖";
	} else {
		tgtElm.style.display="none";
		a.innerHTML="⊕";
	}
	a.blur();
}