<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0
Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=iso-8859-1" />
<title>Number Valid Form</title>
<script type="text/javascript">
function validNumber(thisform)
{
var
num=thisform.num.value;
if(num==null
|| num =="")
{
alert("Enter
the Number");
thisform.num.focus();
return
false;
}
if(isNaN(num))
{
alert("It's
not a Valid Number");
thisform.num.focus();
return
false;
}
return true;
}
</script>
<body>
<form action="number_valid.html"
onsubmit="return validNumber(this)" method="post">
Enter Number
: <input type="text" name="num"/> <br />
<input
type="submit" value="submit"/>
</form>
</body>
</html>
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