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    <title>Document</title>
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<body>
    <input type="textbox" id="t1" placeholder="Enter a Number">
    <input type="button" id="Button1" onclick="MakeTable()" value="Click Me">
    <H1 id="H1"></H1>

    <script>
        function MakeTable()
        {
            var i, result;
            result = "";
            var tableValue = document.getElementById("t1").value;
            for(i=1;i<=1000;i=i+1)
            {
                result= result + tableValue + " x " + i + " = " + tableValue*i + "<BR>";
            }
            document.getElementById("H1").innerHTML=result;
        }
    </script>
</body>
</html>