<html>
<head>
<script language="javascript">
function blockChar(e)
{
var keyVal =(window.event) ? event.keyCode : e.keyCode;
if (window.event) keyVal = window.event.keyCode;
if((keyVal > 64 && keyVal < 93))
{
return false;
}
}
</script>
</head>
<body onload="javascript:document.getElementById('txt').focus();">
<input type="text" id='txt' onkeydown="return blockChar(this);" />
</body>
</html>
Program Demo
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