JS to target new window in drop down

How do I target a new window in these drop-down options using this script (or any other)? Thanks!

<script language=”JavaScript”>
<!–
function gotoLink(form) {
var OptionIndex=form.ListBoxURL.selectedIndex;
parent.location = form.ListBoxURL.options[OptionIndex].value;}
//–>
</script>

<form action=”” method=”post” name=”urlSwitch”>
<select name=”ListBoxURL” size=”1″ language=”javascript” onchange=”gotoLink(this.form);” target=”_blank”>
<option selected=”selected” value=””>Choose an Option…</option>
<option value=”Link 1″>Option 1</option>
<option value=”Link 2″>Option 2</option>
<option value=”Link 3″>Option 3</option>
<option value=”Link 4″>Option 4</option>
</select></form>

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