/*
 * @author  : Greg Wilton
 * @version : 1.0 (2003-11-18)
 *
 * Extensions to the functionality of the CUE javascript
 */
var NavExt = {
/*
 * initialize extensions to the CUE javascript (do on body.onload)
 */
init: function (hasDropdowns, isHierarchical) {
		 if (document.getElementById && document.getElementsByTagName) {
		 		 // if the site uses dropdown menus
		 		 if (hasDropdowns == 1) {
		 		 		 this.addNav1MouseOver("menuTable2");
		 		 }
		 		 // the site must be stuctured with a hierarchical architecture
		 		 if (isHierarchical == 1) {
		 		 		 var style = [{prop:"color",val:"#990000"}, 
		 		 		 		 		 {prop:"fontWeight",val:"bold"}];
		 		 		 var found = this.setActiveMenuItem("tools", style);
		 		 		 if (!found) {
		 		 		 		 found = this.setActiveMenuItem("nav1", style);
		 		 		 		 if (!found) {
		 		 		 		 		 found = this.setActiveMenuItem("nav2", style);
		 		 		 		 }
		 		 		 }
		 		 }
		 }
},
/*
 * changes the style of the menu item that is point to the page being viewed
 */
setActiveMenuItem: function (id, style) {
		 var parent = document.getElementById(id);
		 if (parent != null)  {
		 		 var a = parent.getElementsByTagName("a");
		 		 var loc = document.location.toString();
		 		 for (var i = a.length - 1; i >= 0; i--) {
		 		 		 var href = this.getHref(a[i].href, loc);
		 		 		 if (href == loc) {
		 		 		 		 for (var j = style.length - 1; j >= 0; j--) {
		 		 		 		 		 eval("a[i].style." + style[j].prop + "='" 
		 		 		 		 		 		 		 + style[j].val + "'");
		 		 		 		 }
		 		 		 		 return true;
		 		 		 }
		 		 }
		 }
		 return false;
}, 
/*
 * Helper method to aviod cross-browser inconsistencies with the value returned
 * by calling a.href. (assumes all links are absolute from the root ie. /foo)
 */
getHref: function (href, loc) {
		 if (href.charAt(0) == "/") {
		 		 var domain = loc.substring(0, loc.findInstance("/", 3));
		 		 return domain + href;
		 }
		 return href;
},
/* 
 * Enables the whole menu item on the dropdown menus to be clickable 
 * not just the anchor tag
 */
addNav1MouseOver: function (x) {
		 var tables = document.getElementsByTagName("TABLE");
		 for (var i = tables.length - 1; i >= 0; i--) {
		 		 if (tables[i].className == x) {
		 		 		 var tds = tables[i].getElementsByTagName("TD");
		 		 		 for (var j = tds.length - 1; j >= 0; j--) {
		 		 		 		 var a = tds[j].getElementsByTagName("A");
		 		 		 		 if (a.length > 0) {
		 		 		 		 		 tds[j].$a = a[0];
		 		 		 		 		 tds[j].onclick = function () {
		 		 		 		 		 		 document.location = this.$a;
		 		 		 		 		 };
		 		 		 		 		 tds[j].style.cursor = "pointer";
		 		 		 		 }
		 		 		 }
		 		 }
		 }
}
};
/* ***** */
String.prototype.findInstance = function (substring, instance) {
		 var counter = 0;
		 var pos = -1;
		 while (counter < instance && pos < this.length) {
		 		 if (this.charAt(++pos) == substring) {
		 		 		 counter++;
		 		 }
		 }
		 return (counter == instance) ? pos : -1;
};