<input type="text" id="txtNumber" onKeyPress="return isNumber(event)"/>
<script type="text/javascript">
function isNumber(evt) {
evt = (evt) ? evt : window.event;
var charCode = (evt.which) ? evt.which : evt.keyCode;
if (charCode > 31 && (charCode < 46 || charCode > 57))
return false;
return true;
}
</script>
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