function showhide (num, classname) {
	if (!classname)
		classname = 'listblock';
	var name = classname+num;
	if (document.getElementById(name)) {
		var obj = document.getElementById(name);
		if (obj.style.display=='block')
			obj.style.display = '';
		else if (obj.style.display=='')
			obj.style.display = 'block';
	}
}

function popup_show (id) {
	if (document.getElementById(id)) {
		var obj = document.getElementById(id);
		obj.style.display = 'block';
	}
}
	
function popup_hide (id) {
	if (document.getElementById(id)) {
		var obj = document.getElementById(id);
		obj.style.display = '';
	}
}