<SELECT id=select1 name=select1 size=1 style="HEIGHT: 22px; WIDTH: 290px">
<OPTION>c</OPTION>
<OPTION>b</OPTION>
<OPTION>a</OPTION>
</SELECT><SCRIPT LANGUAGE=javascript>
<!--
select1.remove(0)
//-->
</SCRIPT>
<OPTION>c</OPTION>
<OPTION>b</OPTION>
<OPTION>a</OPTION>
</SELECT><SCRIPT LANGUAGE=javascript>
<!--
select1.remove(0)
//-->
</SCRIPT>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<head>
<script language="javascript">
var m=5;
function addItem(){
var opt = document.createElement("OPTION");
opt.text=m++;
opt.value=m;
document.all.sel.add(opt);
}
function delitem(){
document.all.sel.remove(document.all.sel.selected);
}
</script>
</head>
<body >
<form name="frm">
<div id="lb">
<select id="sel">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</div>
<input type="button" name="Submit" value="add" onclick="addItem()">
<input type="button" value="del" onclick="delitem()">
</form>
</body>
</html>
function removeOptions(id){
while (document.all(id).length>0) {
document.all(id).options.remove(0);
}
}