Check boxes depending on value not name

When my page is loaded I want to check some some checkboxes, e.g. to check whether all except one checkbox's be checked.
I have these fields for example:
<BLOCKQUOTE><font size="1" face="Verdana,Arial,Helvetica">code:</font><HR><pre>
<input type=checkbox name=extraID value=0>
<input type=checkbox name=extraID value=1>
<input type=checkbox name=extraID value=2>
[/code]

What I want to do is to loop through all extraID depending on value (not name)
<dummy code>
<BLOCKQUOTE><font size="1" face="Verdana,Arial,Helvetica">code:</font><HR><pre>
for (i=1;i<2;i++) {
if (document.form.extraID.value[i].checked == true) {
var one_at_least = 1;
}
[/code]

Hope you understand my question.
Thanks.


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