function nav_toggle(num) {
		var number = "cat"+num;
        var block = document.getElementById(number);

        if (block.style.display == 'none') {
                 block.style.display = '';
        } else {
                block.style.display = 'none';
 		}
}


sfHover = function() {
        var sfEls = document.getElementById("menu").getElementsByTagName("LI");
        for (var i=0; i<sfEls.length; i++) {
                if (sfEls[i].className == 'subsub') {
                        sfEls[i].onmouseover=function() {
                                //alert('mouseover');
                                this.className += "Hover";
                        }
                        sfEls[i].onmouseout=function() {
                                //this.className=this.className.replace(new RegExp("( ?|^)sfhover\\b"), "");
                                this.className="subsub";
                        }
                }
        }
}