turning getElementsByTagName into XPath

So I have this xpath evaluate with these following variables:

[CODE] var i, highestValue = boss.preferences.bounty_min, correspondingInput;
var inputs = document.evaluate(“//input[@value=’attack’]”, document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);[/CODE]

to search for the target I want which outputs to

[CODE]correspondingInput = inputs.snapshotItem(i);[/CODE]

How do I convert the next items and use them from the variable: correspondingInput

[CODE] var target_id = divs[i].getElementsByTagName(‘INPUT’)[12].value;
var bounty_id = divs[i].getElementsByTagName(‘INPUT’)[13].value;
[/CODE]

A second question is how do I use Firebug to find the full url for a button like this url. I see the input type elements but not the completed url for that button.

[CODE]‘http://apps.facebook.com/mobwars/fight/do.php?action=attack_bounty&target_id=’+target_id+’&bounty_id=’+bounty_id+’&from=/hitlist/index.php’;[/CODE]

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