问个Js操作Css的难度问题?高人进
Css: 
 #id{font-size:14px;} 
 #id   a{color:red;} 
 #id   a:hover{color:blue;}   
 Javasctipt 
 id.style.fontSize= "18px "; 
 a.style.color= "yellow ";   
 问题 
 Js中如何对a:hover进行操作   
------解决方案-------------------- <style>  
 #ice a{ 
 	color:red; 
 } 
 #ice a:hover{ 
 	color:blue; 
 } 
  </style>  
  </head>  
  <body>  
  <div id= "ice ">  <a href= "# "> test </a>  </div>  
  <input type= "button " value= "setCSS " onclick= "document.styleSheets[0].rules[1].style.color= '#ff0 ' "/>  
  </body>