Allow text box only for letters using jQuery?

by 
<input name="lorem" onkeyup="this.value=this.value.replace(/[^a-z]/g,'');">

And can be the same to onblur for evil user who like to paste instead of typing 😉

[+] Pretty jQuery code:

<input name="lorem" class="alphaonly">
<script type="text/javascript">
$('.alphaonly').bind('keyup blur',function(){ 
    var node = $(this);
    node.val(node.val().replace(/[^a-z]/g,'') ); }
);
</script>

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