<script language=javascript>
function aa(s)
{
document.write(s);
location.href =s;
}
</script>
<select name="example" size="1" onChange="aa(this.value)">
<option value="">select</option>
<option value="www.163.com">应用技术开发网站</option>
<option value="c.htm">国内JavaScript技术网站</option>
<option value="b.htm">国外的著名搜索引擎</option>
</select>
function aa(s)
{
document.write(s);
location.href =s;
}
</script>
<select name="example" size="1" onChange="aa(this.value)">
<option value="">select</option>
<option value="www.163.com">应用技术开发网站</option>
<option value="c.htm">国内JavaScript技术网站</option>
<option value="b.htm">国外的著名搜索引擎</option>
</select>
location.href=document.example.options[document.example.selectedIndex].value