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<script language=java script>
function onlyNum()
{
 if(!(event.keyCode==46)&&!(event.keyCode==8)&&!(event.keyCode==37)&&!(event.keyCode==39))
  if(!((event.keyCode>=48&&event.keyCode<=57)||(event.keyCode>=96&&event.keyCode<=105)))
    event.returnValue=false;
}
</script>

<input onkeydown="onlyNum();">

<script language=jscript>
function number()
{
var char = String.fromCharCode(event.keyCode)
var re = /[0-9]/g
event.returnValue = char.match(re) != null ? true : false
}

function filterInput()
{
if (event.type.indexOf("key") != -1)
{
var re = /37|38|39|40/g
if (event.keyCode.toString().match(re)) return false
}
event.srcElement.value = event.srcElement.value.replace(/[^0-9]/g, "")
}

function filterPaste()
{
var oTR = this.document.selection.createRange()
var text = window.clipboardData.getData("text")
oTR.text = text.replace(/[^0-9]/g, "")
}
</script>

<input onkeypress="number()" onkeyup="filterInput()" onchange="filterInput()" onbeforepaste="filterPaste()" onpaste="return false" style="ime-mode: disabled">