<script language="javascript">function show(){  for (var i=0;i<document.getElementById("s1").length;i++)  {for (var j=0;j<document.getElementById("s2").length-1;j++)     { document.getElementById("s2").options.remove(j);     }    if (document.getElementById("s1").options[i].selected)       {show1(document.getElementById("s1").options[i].value);         break;       }    }}function show1(v){for (var i=1;i<=v;i++){  document.getElementById("s2").options[i]=new Option(i,i);} document.getElementById("s2").options.remove(0);}</script><select name="s1" onchange="show()" id="s1"><option value="">请选择</option><option value=10>10</option><option value=20>20</option><option value=30>30</option><option value=40>40</option></select><select name="s2" id="s2"></select>

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