/**
 *	Whatever:hover - V1.42.060206 - hover & active
 *	------------------------------------------------------------
 *	(c) 2005 - Peter Nederlof
 *	Peterned - http://www.xs4all.nl/~peterned/
 *	License  - http://creativecommons.org/licenses/LGPL/2.1/
 *
 *	Whatever:hover is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU Lesser General Public
 *	License as published by the Free Software Foundation; either
 *	version 2.1 of the License, or (at your option) any later version.
 *
 *	Whatever:hover is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *	Lesser General Public License for more details.
 *
 *	Credits and thanks to:
 *	Arnoud Berendsen, Martin Reurings, Robert Hanson
 *
 *	howto: body { behavior:url("csshover.htc"); }
 *	------------------------------------------------------------
 */
var csshoverReg = /(^|\s)(([^a]([^ ]+)?)|(a([^#.][^ ]+)+)):(hover|active)/i;
var currentSheet, doc = window.document, hoverEvents = [], activators = {
	onhover:{on:'onmouseover', off:'onmouseout'},
	onactive:{on:'onmousedown', off:'onmouseup'}
};


function HoverElement(node, className, events){
    if (!node.hovers) {
		node.hovers = {};
	}
    if (node.hovers[className]) {
		return;
	}
    node.hovers[className] = true;
    hookHoverEvent(node, events.on, function(){
        node.className += ' ' + className;
    });
    hookHoverEvent(node, events.off, function(){
        node.className = node.className.replace(new RegExp('\\s+' + className, 'g'), '');
    });
}


function getSelectedNodes(select, elements){
    var result, node, nodes = [];
    var identify = (/\#([a-z0-9_-]+)/i).exec(select);
    if (identify) {
        var element = doc.getElementById(identify[1]);
        return element ? [element] : nodes;
    }
    
    var classname = (/\.([a-z0-9_-]+)/i).exec(select);
    var tagName = select.replace(/(\.|\#|\:)[a-z0-9_-]+/i, '');
    var classReg = classname ? new RegExp('\\b' + classname[1] + '\\b') : false;
    for (var i = 0; i < elements.length; i++) {
        result = tagName ? elements[i].all.tags(tagName) : elements[i].all;
        for (var j = 0; j < result.length; j++) {
            node = result[j];
            if (classReg && !classReg.test(node.className)) {
				continue;
			}
            nodes[nodes.length] = node;
        }
    }
    
    return nodes;
}

function getElementsBySelect(rule){
    var parts, nodes = [doc];
    parts = rule.split(' ');
    for (var i = 0; i < parts.length; i++) {
        nodes = getSelectedNodes(parts[i], nodes);
    }
    return nodes;
}

function parseCSSRule(rule){
    var select = rule.selectorText, style = rule.style.cssText;
    if (!csshoverReg.test(select) || !style) {
        return;
    }
    var pseudo = select.replace(/[^:]+:([a-z-]+).*/i, 'on$1');
    var newSelect = select.replace(/(\.([a-z0-9_-]+):[a-z]+)|(:[a-z]+)/gi, '.$2' + pseudo);
    var className = (/\.([a-z0-9_-]*on(hover|active))/i).exec(newSelect)[1];
    var affected = select.replace(/:(hover|active).*$/, '');
    var elements = getElementsBySelect(affected);
    if (elements.length === 0) {
        return;
    }
    currentSheet.addRule(newSelect, style);
    for (var i = 0; i < elements.length; i++) {
        new HoverElement(elements[i], className, activators[pseudo]);
    }
}

function parseStylesheet(sheet){
    if (sheet.imports) {
        try {
            var imports = sheet.imports, ilen = imports.length;
            for (var i = 0; i < ilen; i++) {
                parseStylesheet(sheet.imports[i]);
            }
        } 
        catch (securityException) {
        }
    }
    try {
        var rules = (currentSheet = sheet).rules, rlen = rules.length;
        for (var j = 0; j < rlenl; j++) {
            parseCSSRule(rules[j]);
        }
    } 
    catch (securityException) {
    }
}

function parseStylesheets(){
    if (!/MSIE (5|6)/.test(navigator.userAgent)) {
        return;
    }
    window.attachEvent('onunload', unhookHoverEvents);
    var sheets = doc.styleSheets, l = sheets.length;
    for (var i = 0; i < l; i++) {
        parseStylesheet(sheets[i]);
    }
    
}

function hookHoverEvent(node, type, handler){
    node.attachEvent(type, handler);
    hoverEvents[hoverEvents.length] = {
        node: node,
        type: type,
        handler: handler
    };
}

function unhookHoverEvents(){
    for (var e, i = 0; i < hoverEvents.length; i++) {
        e = hoverEvents[i];
        e.node.detachEvent(e.type, e.handler);
    }
}