reset select

[Anon]

I'm trying to de-select all selections from multi <select> on dobbleclick.

Here is my code :
<form NAME="form1" METHOD="POST" ACTION="file.asp">
<select NAME="dep" size="5" onDblClick="test()" multiple>

Here is javascript part :
<script language="vbscript">
sub test
form1.dep.defaultvalue
end sub
</script>

This doesnt work, can anyone tell me why amd hopefully give a solution.

Thanks