请选择一项 北京 上海 深圳 <form name="free" method="post">
<select id="select1" name="select1" onchange="window.open(free.select1.options [selectedIndex].value,target='_blank','top=20,left=200,width=500,height= 460,scrollbars=yes,resizable=yes')">
<option selected>请选择一项</option>
<option value="beijing.asp">北京</option>
<option value="shanhai.asp">上海</option>
<option value="tianjin.asp">天津</option>
<option value="shenzhen.asp">深圳</option>
<option value="guangzhou.asp">广州</option>
</select>
……