https://2feettall.co.nz/assets/CatalystScripts/Java_DynMenusSelectedCSS.js

1function catSetSelectedCSSItem(menuid) {
2    var _host = document.location.host;
3	var _url = document.location.href.substring(document.location.href.indexOf(_host)+_host.length).toLowerCase();
4	var _anchor;
5    var _parent;
6    var _class;
7    var _image;
8    var _anchors = document.getElementById(menuid).getElementsByTagName('a');
9
10	var ie = false;
11	var detect = navigator.userAgent.toLowerCase();	
12	if (detect.indexOf('msie') > 0) ie = true;
13	    
14	if (_url.indexOf('?') != -1) _url = _url.substring(0,_url.indexOf('?')); // must remove query variables
15
16    for (var i=0;i<_anchors.length;i++) {
17	    _anchor = _anchors[i].href.substring(document.location.href.indexOf(_host)+_host.length).toLowerCase();
18	    if (_anchor == _url) {
19            _image = _anchors[i].getAttribute('selimg'); // sel img is on anchor
20			if (_image)
21			    _anchors[i].style.background = "url("+_image+")";					
22		    _parent = _anchors[i].parentNode; // get li node
23		    while (_parent) {
24			    if (_parent.id == menuid) break; // don't go up infinitely
25			    if (_parent.tagName == "LI") {
26				    _class = _parent.getAttribute('selcss'); // sel css is on li
27				    if (_class)				
28					    _parent.className = _class; 
29				    else { // logic below as per partner req't
30				        if (ie){
31                                var ver = getInternetExplorerVersion();
32                                if (ver > -1) {
33                                    if (ver >= 8.0)
34                                        _class = _parent.getAttribute('class'); 
35                                    else
36                                        _class = _parent.getAttribute('className'); 
37                                }
38                            } 				            
39				        else
40				            _class = _parent.getAttribute('class'); 
41				            
42				        if (_class)
43					        _parent.className = _class+" selected";	
44				        else
45				            _parent.className = "selected";	
46					    //when you mouse over the selected class get removed. fix..
47				        _parent.onmouseout = function(val) {
48				            return function() {
49				                if (val)
50				                    this.className = val + " selected";
51				                else
52				                    this.className = "selected";
53				            }
54				        } (_class);					            
55				        
56					}
57			    }
58			    _parent = _parent.parentNode;
59		    }
60		    break;
61	    }
62	}
63}
64
65
66function getInternetExplorerVersion() {
67    var rv = -1; // Return value assumes failure.
68    if (navigator.appName == 'Microsoft Internet Explorer') {
69        var ua = navigator.userAgent;
70        var re = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
71        if (re.exec(ua) != null)
72            rv = parseFloat(RegExp.$1);
73    }
74    return rv;
75}