Javascript selecting row

Hello,
 
I am after getting a cell value from a clicked Cell ..
 
So far I have teh following javascript function:
 
<script type="text/javascript">
function getInfo()
{
var Row = document.getElementById("tblrow");
var Cells = Row.getElementsByTagName("td");
alert(Cells[0].innerText);
}
</script>
 
Which is on the onclick event of my tablerow it works fine but only gets the first name in the list regardless of which cell I click...
 
Does anyone know how I can get it to give the value of the row which is clicked?
 
Many Thanks
 
James