function dmouseMove(o){
		var id , j , e;
        try{
		 for (var i = 0 ; i < 3; i++ )
		 {
		  id = "dimbtn" + i ;
		  //取得导航栏里id的属性
		  j = document.getElementById(id);
		  
		  //取得内容栏里的id的值
		  e = document.getElementById("dd_con"+i);
		  
		  if( id != o.id ) {
		   	j.className = "itemOff";
			e.style.display = "none";
		  }else{
		  	j.className = "itemOn";
		    e.style.display = "block";
		  }
		 }}
         catch(e){}
	}

function $(id) 
{ 
  return document.getElementById(id); 
}