<input type="text" onkeyup="javascript:format(this)" />
<script>
function format(n)
{
var re=/(\d{1,3})(?=(\d{3})+(?:$|\D))/g var n1=n.value.replace(/,/g,'').replace(re,"$1,")
n.value=n1;;
}</script>
<script>
function format(n)
{
var re=/(\d{1,3})(?=(\d{3})+(?:$|\D))/g var n1=n.value.replace(/,/g,'').replace(re,"$1,")
n.value=n1;;
}</script>
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