/*解决ie6.0 的hover兼容问题*/  
 <attach event="ondocumentready" handler="parseStylesheets" />  
<script>  
  
   
 var csshoverReg = /(^|\s)(([^a]([^ ]+)?)|(a([^#.][^ ]+)+)):(hover|active)/i,  
 currentSheet, doc = window.document, hoverEvents = [], activators = {  
     onhover:{on:'onmouseover', off:'onmouseout'},  
    onactive:{on:'onmousedown', off:'onmouseup'}  
}  
   
 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 parseStylesheet(sheet) {  
         if(sheet.imports) {  
             try {  
                 var imports = sheet.imports, l = imports.length;  
                 for(var i=0; i<l; i++) parseStylesheet(sheet.imports[i]);  
             } catch(securityException){}  
         }  
  
        try {  
            var rules = (currentSheet = sheet).rules, l = rules.length;  
            for(var j=0; j<l; j++) parseCSSRule(rules[j]);  
        } catch(securityException){}  
     }  
  
    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 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 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);  
        }  
    }  
   
 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 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;  
    }  
</script>