HTML Table ID

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I get a collection of tables as below in Javascript

var eleTables = document.getElementsByTagName("table");

I then loop through my tables as below

My Table id is always blank when I try to alert it and yet my table has an
id (<table border="0" cellspacing="0" cellpadding="0"
id="igtabctl00_MainContent_uctrFinancialAccountsCo ntainer_UltraWebTab1"
width="100%" height="80%" style="position:relative;">)

Anyone know why this is the case?

for (var i=0; i < eleTables.length; i++)

{

var elTableID = eleTables[i];

alert('table id ' + eleTables[i].id);

}