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Generate Sqare Matrix: HTML & jScript

<html>
<head>
    <script>
        function mktab(a)
        {
            var i=1;
            var j=1;
            var cnt=1;
          
            document.write("<center><table border=0 bordercolor=black style='color:white;font-size:25'>");
            for(i=1;i<=a;i++)
            {
                document.write("<tr border=0>")
                for(j=1;j<=a;j++)
                {
document.write("<td bgcolor=rgb("+(i+50)+","+(j+50)+","+i+")>*</td>");
                    cnt=cnt+1;
                }
                document.write("</tr>");
            }
            document.write("</table></center>");
        }
    </script>
</head><body>
    <center>
        Enter Matrix<sup><B>SQUARE</B></sup> limit  : <input type="text" id="t1"/>
        <input type="button" value="Create" onClick="mktab(eval(document.all.t1.value))"/>
        <br/>(Eg. 2) {It will generate 2*2=4 cell table}
    </center>
</body>
</html>
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