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

	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";

            //do we need to hide select boxes on sector result pages
            if(document.getElementById("spcatcode"))
            {
            	document.getElementById("spcatcode").style.visibility = "hidden";
            }
            if(document.getElementById("respage"))
            {
            	document.getElementById("respage").style.visibility = "hidden";
            }
            if(document.getElementById("orderby"))
            {
            	document.getElementById("orderby").style.visibility = "hidden";
            }
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
            //do we need to hide select boxes on sector result pages
            if(document.getElementById("spcatcode"))
            {
            	document.getElementById("spcatcode").style.visibility = "visible";
            }
            if(document.getElementById("respage"))
            {
            	document.getElementById("respage").style.visibility = "visible";
            }
            if(document.getElementById("orderby"))
            {
            	document.getElementById("orderby").style.visibility = "visible";
            }
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);