Attaching information to a dom node using javascript

I had a requirement in my project where i had to attach some information to a dom node using javascript.
I created some checkboxes using DOM’s createElement method. Now the task was to assign userId information to each checkbox.
I knew that i can’t use the userId attribute for the “input” tag.

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<input id="chk1" type="checkbox" />

The above code does not work.

So i did the following to attach userId info to the checkbox.

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var chkBox=document.createElement("input");
chkBox.type="checkbox";
chkBox.id="chk1";
chkBox.userId="devang@cisco.com";

And this is how i retrieved the userId info attached to the checkBox.

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var userId=document.getElementById('chk1').userId;

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