var isOpera = (navigator.userAgent.indexOf("Opera") != -1);
var isIE6 = ((!isOpera)&&(navigator.appName.indexOf("Microsoft Internet Explorer") != -1)&&(navigator.appVersion.indexOf("MSIE 6.0") != -1));


function menu_on(obj,number) {
	var li = obj.parentNode;
	if (isIE6 && document.forms["form"] && (number==3 || number==4 || number==9)) document.forms["form"].style.visibility = 'hidden';
	li.className+=" over";
}

function menu_off(obj,number) {
	var li = obj.parentNode;
	if (isIE6 && document.forms["form"] && (number==3 || number==4 || number==9)) document.forms["form"].style.visibility = 'visible';
	li.className=li.className.replace(" over", "");
}