下拉列表的问题

[stonemusic]

如何用javascript实现一个下拉列表改变后,另一个下拉列表的内容随之而变化?

[UU码农]

<SELECT ID="oCars" SIZE="1" onchange="fnChange()">
<OPTION VALUE="1">BMW
<OPTION VALUE="2">PORSCHE
<OPTION VALUE="3" SELECTED>MERCEDES
</SELECT>

<SELECT style="width=100" >
<option id='option'>
</SELECT>

<SCRIPT LANGUAGE="JavaScript">
function fnChange()
{
option.innerText = oCars.options[oCars.selectedIndex].text;
}
</SCRIPT>

[meizz]

到ASP版里的FAQ里看看联动下拉框