<script language="javascript">
function checkchange(oneinput)
{
var digit='0123456789';
for (var oi=0;oi<oneinput.value.length.oi++)
{
var onechar=oneinput.value.substr(oi,1);
if (digit.indexOf(onechar)==-1)
{
alert('You must use only numbers');
oneinput.focus();
oneinput.value='';
return;
}
}
}
</script>
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