我在写判断表单的日期，用JAVASCRIPT来检测的。

<form action="hotelsearch.asp" method="post" target="_blank">
    <tr> 
      <td height="25" colspan="2">&nbsp;</td>
    </tr>
    <tr> 
      <td height="24" colspan="2"><table width="100%" height="20" border="0" cellpadding="0" cellspacing="0">
          <tr> 
            <td width="25%" align="right"><img src="images/bed.gif" width="24" height="20">　</td>
            <td width="25%">　<span class="title"><font color="#FF9933">酒店</font></span></td>
            <td width="25%" align="center" class="title"> <div align="right"><a href="middle03.asp"><img src="images/plain.gif" width="23" height="20" border="0"></a>　</div></td>
            <td width="25%"><span class="title"><font color="#FF9933">　</font></span>机票</td>
          </tr>
        </table></td>
    </tr>
    <tr> 
      <td height="30" colspan="2"> <table width="320" border="0" cellspacing="0" cellpadding="0">
          <tr> 
            <td width="82">　入住日期：</td>
            <td width="188"><font color="101073">
              <input name="startdate" type="text" id="startdate">
              </font></td>
            <td width="50">&nbsp;</td>
          </tr>
        </table></td>
    </tr>
    <tr> 
      <td height="30" colspan="2"> <table width="320" border="0" cellspacing="0" cellpadding="0">
          <tr> 
            <td width="83">　离店日期：</td>
            <td width="191"> <font color="101073">
              <input name="enddate" type="text" id="enddate">
              </font></td>
            <td width="46">&nbsp;</td>
          </tr>
        </table></td>
    </tr>
    <tr> 
      <td height="30" colspan="2"> <table width="320" border="0" cellspacing="0" cellpadding="0">
          <tr> 
            <td width="83">　城　　市：</td>
            <td width="70"><select name="select5">
                <option>福建</option>
                <option>北京</option>
                <option>上海</option>
                <option>广东</option>
                <option>浙江</option>
              </select></td>
            <td width="167"><select name="city" id="city">
                <option>厦门</option>
                <option>泉州</option>
                <option>福州</option>
                <option>武夷山</option>
                <option>莆田</option>
              </select></td>
          </tr>
        </table></td>
    </tr>
    <tr> 
      <td height="30" colspan="2"> <table width="100%" border="0" cellspacing="0" cellpadding="0">
          <tr> 
            <td width="24%"><font color="101073">　</font>星　　级<font color="101073">：</font></td>
            <td width="21%"><select name="star" id="star">
                <option value="6">不限</option>
                <option value="2">二星</option>
                <option value="3">三星</option>
                <option value="4">四星</option>
                <option value="5">五星</option>
              </select></td>
            <td width="18%"><font color="101073">价　格：</font></td>
            <td width="37%"><select name="price" id="price">
                <option value="6">不限</option>
                <option value="1">200以下</option>
                <option value="2">200-300</option>
                <option value="3">300-500</option>
                <option value="4">500-800</option>
                <option value="5">800以上</option>
              </select></td>
          </tr>
        </table></td>
    </tr>
    <tr> 
      <td width="82">　宾馆名称：</td>
      <td width="258" height="34"> <input name="hotelname" type="text" class="nameborder" id="hotelname" size="30"> 
      </td>
    </tr>
    <tr> 
      <td colspan="2" valign="top"><div align="right">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
            <tr> 
              <td width="29%"><div align="right"><a href="hotel.asp" target="_blank"><br>
                  <img src="images/icon02.jpg" width="15" height="15" border="0"></a></div></td>
              <td width="30%"> <br>
                <a href="hotel.asp" target="_blank">高级查询</a></td>
              <td width="41%" valign="bottom">
<input name="imageField" type="image" class="special" src="images/indexfind.gif" width="38" height="21" border="0"></td>
            </tr>
          </table>
        </div>
        　　　　　　　　　　 </td>
    </tr>
  </form>