access a checkbox in javascript!

["chandar" <canguy001@xxxxxxxxxxx>]

Hi 
I am trying access a checkbox which has some restrictions in the 
naming conventions

i have a check box with the following property

<input type=checkbox name=1.1.1>

Here the restrictions are we cannot assign the id for this checkbox.
How can we access the check box in javascript onclick of a button
as this is "1.1.1" it throws some error when i acces 
using document.frm.1.1.1.value

I used a other alternative 
ie 

if (navigator.appName == "Netscape") {
	doc_obj=document.frm.elements["1.1.1"].checked;
}else{
			doc_obj=document.getElementById
("1.1.1").checked;
}

Is there any other work around other than this.
here i have to mention browser specific code sepraterly.








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