function writeSessionCookie (cookieName, cookieValue) {
    document.cookie = escape(cookieName) + "=" + escape(cookieValue) + ";";
}

function toggle_visibility(id){
	if(document.getElementById(id).style.display == "block") {
		document.getElementById(id).style.display = "none";
		writeSessionCookie (id, "0");//Addition for remembering expanded state of pages
	} else {
		document.getElementById(id).style.display = "block";
		writeSessionCookie (id, "1");//Addition for remembering expanded state of pages
	}
}
var plus = new Image;
var tempUrl;
plus.src = tempUrl + "/plus.gif";
var minus = new Image;
minus.src = tempUrl + "/minus.gif";

function toggle_plus_minus(id) {
	var img_src = document.images['plus_minus_' + id].src;
	if(img_src == plus.src) {
		document.images['plus_minus_' + id].src = minus.src;
	} else {
		document.images['plus_minus_' + id].src = plus.src;
	}
}



/* FS Gallery A-Z index */
activateMenu = function(nav) {
    /* currentStyle restricts the Javascript to IE only */
	if (document.all && document.getElementById(nav).currentStyle) {
       var navroot = document.getElementById(nav);

		/* Get all the list items within the menu */
		var lis=navroot.getElementsByTagName("LI");
        for (i=0; i<lis.length; i++) {

           /* If the LI has another menu level */
            if(lis[i].lastChild.tagName=="UL"){

                /* assign the function to the LI */
             	lis[i].onmouseover=function() {

                   /* display the inner menu */
                   this.lastChild.style.display="block";
                }
                lis[i].onmouseout=function() {
                   this.lastChild.style.display="none";
                }
            }
        }
    }
}

window.onload= function(){
    /* pass the function the id of the top level UL */

    /* remove one, when only using one menu */
    activateMenu('nav');
    /* activateMenu('vertnav'); */
}