How should I provide a java script validation to validate name in a textbox

<input type = "text" id = "txtState" />
<input type = "button" id = "btnValidate" value = "Submit" />

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
    $("#btnValidate").live("click", function () {
        var regex = /^[a-zA-Z ]*$/;
        if (regex.test($("#txtState").val())) {
            alert("Valid");
        } else {
            alert("Invalid");
        }
    });
</script>