asp中的map,area标签的使用
<map name="Map2" id="Map2">
<area shape="rect" coords="21,7,87,28" href="docc/gsjj.asp" />
<area shape="rect" coords="111,6,178,27" href="docc/zlrz.asp" />
<area shape="rect" coords="201,7,268,28" href="docc/cpzs.asp" />
<area shape="rect" coords="290,6,356,27" href="docc/zxdd.asp" />
<area shape="rect" coords="382,6,431,28" href="docc/lyb.asp" />
<area shape="rect" coords="454,6,521,28" href="docc/lxfs.asp" />
<area shape="rect" coords="544,6,605,26" href="doce/gsjj.asp" />
</map>
这段代码什么意思?coords="21,7,87,28"是什么意思啊?