<script language=javascript>
function onlyNum()
{if(!((event.keyCode>=48&&event.keyCode<=57)||(event.keyCode>=96&&event.keyCode<=105)))
event.returnValue=false;}
</script>
<input οnkeydοwn="onlyNum();">
function onlyNum()
{if(!((event.keyCode>=48&&event.keyCode<=57)||(event.keyCode>=96&&event.keyCode<=105)))
event.returnValue=false;}
</script>
<input οnkeydοwn="onlyNum();">
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