javascript and multiple select

Hi,

I have several <select name="name1[]" multiple> that each contains several options.
What I want is to see if a sertain option is selected. The problem is that I don't know how to do that if the name of the select have [] at the end.

I've managed to do this if I don't add [] at the end of the name, but then I can't send all the values if I select several, becouse it only sends the last selected value and treats it as a string, not an array:

function check_write(value) {
if (value.options[1].selected == 0) {
theform.manage.options[1].selected = 1;
}
}

....

<select name="manage" onChange="check_write(this);">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>



What I need to know is how I can do a script that works as the one above, but treats the select (manage) as an array instead of a string.

Thanks,
Martin Henriksson