<script language="javascript">
function OnCall() {
var aaa = "1|aaa|2|bbb|3|ccc|4|ddd|";
var bbb = aaa.split("|");
var count = (bbb.length - 1) / 2;
for (var i = 0; i <= count; i++) {
document.all("DropDownList2").options.add(new Option(bbb[i], bbb[i + 1]));
}
return;
}
<script>