function ShowHidedisplay(id) {
    obj = document.getElementsByTagName("ul");
    if (obj[id].style.display == 'block'){
    obj[id].style.display = 'none';
    }
    else {
    obj[id].style.display = 'block';
    }
}

sfHover = function() {
	var sfEls = document.getElementById("left_navi").getElementsByTagName("li");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);