var kbNavCurrent = -1;
    var kbNavItems = new Array();
    
    function __kbnav_init() {
        kbNavItems = new Array();
        var list = document.getElementsByTagName('li');
        for(var i=0;i<list.length;i++) {
            if (list[i].className && list[i].className.indexOf('item') == 0) {
                kbNavItems.push(list[i]);
            }
        }
        var span = document.createElement('span');
        span.style.position='absolute';
        span.style.color = 'black';
        span.style.display = 'none';
        span.style.fontWeight = 'bold';
        span.id = 'kbnavptr';
        span.innerHTML = '&gt;';
        document.body.appendChild(span);
    }

    function __kbnav_CurrentItemData() {
        if (kbNavCurrent == -1)kbNavCurrent=0;
        var item = kbNavItems[kbNavCurrent];
        if (item) {
			var ret = {};
			if (rx = new RegExp(".*es.([0-9]+),([0-9]+).*,([0-9]+).*","gm").exec(item.innerHTML)) {
				ret.id = rx[1];
				ret.state = rx[2];
				ret.cid = rx[3];
			} else {
				ret.id = item.id.replace(/[^0-9]/g,'');
			}
			var links = item.getElementsByTagName('a');
			for(var i=0;i<links.length;i++){
				if(links[i].className.indexOf('item_url') > -1) {
					ret.url = links[i].href;
					break;
				}
			}
			return ret;
        }

        return null;
    }

    function __kbnav_ToggleCollapse() {
        if ('function' == typeof(toggleItemByID)) {
            var r=__kbnav_CurrentItemData();
            if (null != r && r.id) {
                toggleItemByID(r.id);
            }
        }
		return false;
    }
    
    function __kbnav_ToggleSticky() {
        if ('function' == typeof(_stickyflag_sticky)) {
            var r=__kbnav_CurrentItemData();
            if (null != r && r.id && r.state) {
                _stickyflag_sticky(r.id, r.state);
            }
        }
        return false;
    }

    function __kbnav_ToggleFlag() {
        if ('function' == typeof(_stickyflag_flag)) {
            var r=__kbnav_CurrentItemData();
            if (null != r && r.id && r.state) {
                _stickyflag_flag(r.id, r.state);
            }
        }
        return false;
    }
    
    function __kbnav_scrollTo(i) {
        if (kbNavItems[kbNavCurrent+i]) {
            var y = kbNavItems[kbNavCurrent+i].offsetTop - 10;
            var span = document.getElementById('kbnavptr');
            
            if (y > 0) {
                window.scrollTo(0,y -5);
                span.style.display = 'inline';
                span.style.top = (10 + kbNavItems[kbNavCurrent+i].offsetTop) +'px';
                span.style.left = (-12 + kbNavItems[kbNavCurrent+i].offsetLeft) +'px';
                kbNavCurrent += i;
                if (kbNavCurrent < 0) {
                    kbNavCurrent = 0;
                } else if (kbNavCurrent > kbNavItems.length -1) {
                    kbNavCurrent = kbNavItems.length -1;
                }
            }
        }
        return false;
    }
    
    function __kbnav_Next() {
        return __kbnav_scrollTo(1);
    }
    
    function __kbnav_ScrollTop() {
        window.scrollTo(0,0);
        document.getElementById('kbnavptr').style.display = 'none';
        kbNavCurrent = -1;
        return false;
    }
    
    function __kbnav_NextMarkRead() {
        var r=__kbnav_CurrentItemData();

        if (null != r && (r.state & 1)) {
            if (! document.all) {
                c = unreadCnt(-1,r.cid);
         	} else {
            	c = 1;
         	}
            setItemHide(r.id, (c == 0));
            setState(r.id,r.state & 30);
            kbNavItems.splice(kbNavCurrent,1);
            __kbnav_scrollTo(0);
        } else if(null != r) {
            // non logged in users can't mark as read, so let this behave as a scroll.
            __kbnav_scrollTo(1);
        }
        return false;
    }
    function __kbnav_Prev() {
        return __kbnav_scrollTo(-1);
    }
    
	function __kbnav_OpenUrl() {
		var r = __kbnav_CurrentItemData();
		if (null != r && r.url) {
			document.location=r.url;
		}
		return false;
	}
	function __kbnav_OpenUrlNW() {
		var r = __kbnav_CurrentItemData();
		if (null != r && r.url) {
			window.open(r.url,'_blank');
		}
		return false;
	}
	function __kbnav_MarkAllRead() {
		var forms = document.getElementsByTagName('form');
		for(var i=0;i<forms.length;i++) {
			if (forms[i].className == 'markReadForm') {
				forms[i].submit();
				break;
			}
		}
		return false;
	}
	function __kbnav_EditTags() {
		var r = __kbnav_CurrentItemData();
		if (null != r && r.id && 'function' == typeof(_et)) {
			_et(r.id);
		}
	}