Search.product_kindid.options.length=0;  
Search.product_kindid.disabled = true;
Search.product_kindid.options.add(new Option("选择类别",""));
Search.product_kindid.options.add(new Option("电脑硬件","1"));
  Search.product_kindid.options.add(new Option("电脑整机","2"));
  Search.product_kindid.options.add(new Option("办公外设","3"));
  Search.product_kindid.options.add(new Option("网络通讯","5"));
  Search.product_kindid.options.add(new Option("多 媒 体","6"));
  Search.product_kindid.options.add(new Option("消耗材料","7"));
  Search.product_kindid.options.add(new Option("软件产品","8"));
  Search.product_kindid.options.add(new Option("数码产品","9"));
  Search.product_kindid.options.add(new Option("周边配件","10"));
  Search.product_kindid.options.add(new Option("存储产品","11"));
  Search.product_kindid.options.add(new Option("无线网络","12"));
  Search.product_kindid.options.add(new Option("商用系统","13"));
  Search.product_kindid.options.add(new Option("游戏设备","14"));
  Search.product_kindid.options.add(new Option("数字家电","15"));
  
Search.product_kindid.disabled = false;