Code
<center><SCRIPT LANGUAGE="JavaScript" TYPE="text/javascript">clr=new Array('00','20','40','60','80','a0','c0','ff');for (i=0;i<8;i++) { document.write("<table border=0 cellpadding=2>");for (j=0;j<8;j++) {document.write("<tr>");for (k=0;k<8;k++) {document.write('<td bgcolor="#'+clr[i]+clr[j]+clr[k]+'">');document.write('<tt><font color="#'+clr[7-i]+clr[7-j]+clr[7-k]+'"> ');document.write(clr[i]+clr[j]+clr[k]+' </font></tt></td>'); }document.write("</tr>"); }document.write("</table><br>"); }// end --></script></center>