Edit in JSFiddle

<body>
<input type="text" id="input" name="value">
<p id="result"></p>
<input id="button" type="button" value="Check Value" />
$("#button").click(function(){
if($.isNumeric( $('#input').val()))
 {
$('#result').html('Value is Numeric');
 }
else
 {
$('#result').html('Value is not Numeric');
 }
});