copia el siguiente texto un archivo .htm:
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Construir tabla de colores con Javascript</title>
</head>
<body>
<h1 align="center">Tabla de colores<br>Javascript</h1>
<table width="80%" align="center">
<script language="javascript">
var r = new Array("00","33","66","99","CC","FF");
var g = new Array("00","33","66","99","CC","FF");
var b = new Array("00","33","66","99","CC","FF");
for (i=0;i<r.length;i++)
for (j=0;j<g.length;j++) {
document.write("<tr>");
for (k=0;k<b.length;k++) {
var nuevoc = "#" + r[i] + g[j] + b[k];
document.write("<td bgcolor=\"" + nuevoc + "\" align=center>");
document.write(nuevoc);
}
document.write("</tr>");
}
</script>
</table>
</body>
</html>
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te fijas que esta mezclado html con script.
