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<form action="Compare.asp" method="post" name="form" id="form">
<select name="typeid" onChange="ChangeType()" size="1">
function ChangeType()
{
document.getElementById("BigClassID").options[0].selected=true;
document.getElementById("SmallClassID").options[0].selected=true;
ToSubmit();
}
function ToSubmit()
{
document.form.Compare.options[0].selected=false;
for (var j = 1; j < document.form.Compare.length; j++)
document.form.Compare.options[j].selected=true;
document.form.submit();
}
<form action="" name="form">
<select name="Compare" id="">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</form>
<script>
document.form.Compare.options[0].selected=false;
for (var j = 1; j < document.form.Compare.length; j++)
document.form.Compare.options[j].selected=true;
// document.form.submit();
</script>