请教 html table表格合并 如何做

请问 html table表格合并 怎么做？
比如
    <table   id= "table1 "   border= "1 "   bordercolor= "black ">
        <tr> <td   bgcolor= 'green '   height= "50px "   style= "width:   50px; "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> </tr>
        <tr> <td   bgcolor= 'green '   height= "50px "   style= "width:   50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> </tr>
        <tr> <td   bgcolor= 'green '   height= "50px "   style= "width:   50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> </tr>
        <tr> <td   bgcolor= 'green '   height= "50px "   style= "width:   50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> </tr>

        <tr> <td   bgcolor= 'green '   height= "50px "   style= "width:   50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> </tr>
  <%--       <tr> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> </tr> --%>
    <%--     <tr> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> <td   width= "50px "   bgcolor= 'green '   height= "50px "> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   </td> </tr> --%>
        </table>

[解决办法]
让小客客给你写一正则
[解决办法]
<table id= "tb1 " border= "1 "> <tr> <td> a </td> <td> b </td> <td> c </td> </tr> </table>
------解决方案--------------------

可以用鼠标去框着选
然后合吗？

＝＝＝＝＝＝＝＝
若是设计时，

VS 的设计器支持
[解决办法]
先用网页三剑客的ＤｒｅａｍＷｅａveｒ,作好布局，再把代码贴过来。