首页如何做导航
原来做的首页是静态的。都是写死的。现在要将这些变成动态的。静态代码为以下：
        <tr>
                <td   height= "31 "   colspan= "4 "   valign= "top "> <img   src= "imges/Snap21.gif "   alt= " "   width= "40 "   height= "31 ">

<span   class= "STYLE7 ">
<ahref= "main.aspx "   target= "_self "> </a>
</span>

<span   class= "STYLE7 ">
<a   href= "main.aspx "   target= "_self "> <img   src= "imges/sy.gif "   alt= "a "   width= "59 "   height= "31 "   border= "0 "> </a>
</span>

<span   class= "STYLE7 ">
<a   href= "main.aspx?sort=0008 "   target= "_self "> <img   src= "imges/zhgl.gif "   alt= " "   width= "88 "   height= "31 "   border= "0 "> </a>
</span>

<spanclass= "STYLE7 ">
<a   href= "main.aspx?sort=0009 "> <img   src= "imges/zlgl.gif "   alt= " "   width= "87 "   height= "31 "   border= "0 "> </a>
</span>

<span   class= "STYLE7 ">
<a   href= "main.aspx?sort=0010 "   target= "_self "> <img   src= "imges/aqgl.gif "   alt= " "   width= "89 "   height= "31 "border= "0 "> </a>
</span>

<spanclass= "STYLE7 ">
<a   href= "main.aspx?sort=0012 "   target= "_self "> <img   src= "imges/gctj.gif "   alt= " "   width= "87 "   height= "31 "   border= "0 "> </a>
</span>

<spanclass= "STYLE7 ">
<a   href= "main.aspx?sort=0011 "target= "_self "> <img   src= "imges/tzgl.gif "   alt= " "   width= "89 "   height= "31 "   order= "0 "> </a>
</span>

<spanclass= "STYLE7 ">
<a   href= "main.aspx?sort=0005 "   target= "_self "> <img   src= "imges/jdgl.gif "   alt= " "   width= "89 "   height= "31 "   border= "0 "> </a>
</span>

<span   class= "STYLE7 ">
<a   href= "main.aspx?sort=0006 "target= "_self "> <img   src= "imges/htgl.gif "   alt= " "   width= "88 "   height= "31 "   border= "0 "> </a>
</span>


<span   class= "STYLE7 ">
<a   href= "main.aspx?sort=0002 "   target= "_self " "> <img   src= "imges/spjk.gif "   alt= " "   width= "89 "   height= "31 "   border= "0 "> </a>
</span>

<span   class= "STYLE7 ">
<a   href= "main.aspx?sort=0003 "target= "_self "> <img   src