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window.onload=function(){
var testInput = document.getElementById('test');
testInput.onkeyup = function() {
this.value=this.value.replace(/[\s\S]/g,'');
//stopDefault(e);
}
}
</script>
<form name="formA" method="post" >
<input type=text name="a" id="test" >
<form>
<input type="text" value="TEST" id="demo" />
<script type="text/javascript">
document.getElementById('demo').onkeydown = function() { return false; }
</script>