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- <html>
- <head>
- <script type="text/javascript">
- function checkForm()
- {
- var number=document.getElementById("text").value;
- if (!isNaN(number))
- {
- alert("Hooray! It's a number!");
- }
- else
- {
- alert("Not a number...");
- }
- }
- </script>
- </head>
- <body>
- <form name="myform">
- <p>Enter a number. </p><input type="text" id="text" name="text" />
- <input type="button" name="button" id="button" onclick="checkForm()" value="Submit your number!" />
- </form>
- </body>
- </html>
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