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<SCRIPT language="javascript" >
function showSelected()
{
var f = document.getElementById("age");
var i = f.options.selectedIndex;
alert("之前:" + cur);
alert("现在:" + f.options[i].value);
cur = f.options[i].value;
}
var cur;
window.onload=function(){
var f = document.getElementById("age");
cur = f.options[f.selectedIndex].value;
}
</SCRIPT>
<SELECT id="age" name="age" onchange="showSelected();">
<OPTION value=16 >16Years </OPTION>
<OPTION value=18 selected>18Years </OPTION >
<OPTION value=20 >20Years </OPTION>
</select>