关于下拉框的问题！请教！

Question

<form name="form1">
  <select name="menu1" onChange="MM_jumpMenu('parent',this,0)">
    <option value="1.html" selected>123</option>
    <option value="2.html">234</option>
  </select>
</form><script language="JavaScript" type="text/JavaScript">
<!--
function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}
//-->
</script>

Answer 1

<select name="sel" onchange="location.href=this.value">
<option value="">请选择
<option value="1.htm">1
<option value="2.htm">2
</select>