function check_word()
  {
    var word=document.getElementById("word");
	if(word.value=="")
	   {
	     alert('请您输入要搜索的内容');
		 word.focus();
		 return false;
	   }
	 location.href="/search.asp?word="+trim(word.value);
  }
function change(num,s)
{
  var menu=document.getElementById("menu" + num);
  //document.write(s);
  if(s == 1)
     {
	   menu.className="menu_on";
	 }else{
	 menu.className = "";
	 }
}
function trim(str) 
{ 
var str_t=str.replace(/\s+/g,"");
return str_t;
}