sfHover = function() {
	var sfEls = document.getElementById("nav").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);


function showDiv(div_num,title_num,arr_num) {
	if (document.getElementById(div_num).style.visibility == "visible") {
		document.getElementById(div_num).style.display = "none";
		document.getElementById(div_num).style.visibility = "hidden";
		document.getElementById(title_num).style.display = "none";
		document.getElementById(title_num).style.visibility = "hidden";
		document.getElementById(arr_num).innerHTML = "";
	} else if (document.getElementById(div_num).style.visibility == "hidden") {
		document.getElementById(div_num).style.display = "block";
		document.getElementById(div_num).style.visibility = "visible";
		document.getElementById(title_num).style.display = "block";
		document.getElementById(title_num).style.visibility = "visible";
		document.getElementById(arr_num).innerHTML = "&uarr;";
	}
}