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<script language="javascript">
function IsDigit(cCheck)
{
return (('0'<=cCheck) && (cCheck<='9'));
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function IsAlpha(cCheck)
{
return ((('a'<=cCheck) && (cCheck<='z')) || (('A'<=cCheck) && (cCheck<='Z')))
}
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<head>
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<body>
<form id=aa name=aa>
<input type=button value="ͬÒâ(10)" id=a1 disabled="disabled">
</form>
</body>
</html>
<script>
var num=10;
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