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<script language="JavaScript">
function color(frm, clr, val)
{
	v = eval("0x" + frm[clr].value) + val;
	if (v < 0 || v > 255) v -= val;
	v = v.toString(16).toUpperCase();
	while (v.length < 2) v = "0" + v;
	frm[clr].value = v; nc = "";
	for(i = 1; i < 8; i += 3) nc += frm.elements[i].value;
	document.bgColor = nc;
}

function setval(item)
{
	v = prompt("New value for " + item.name + " (00 - FF)", item.value);
	if (v)
	{
		v = eval("0x" + v);
		if ((v & 255) == v)
		{
			item.value=v.toString(16).toUpperCase();
			while (item.value.length < 2) item.value = "0" + item.value;
			color(document.f, item.name, 0);
     }
  }
}
</script> 
¡¡<table border=1>
¡¡¡¡¡¡¡¡¡¡¡¡<tr>
¡¡¡¡¡¡¡¡¡¡¡¡¡¡<td colspan=3 align=center bgcolor="#ff0000">RED</td>
¡¡¡¡¡¡¡¡¡¡¡¡¡¡<td colspan=3 align=center bgcolor="#00ff00">GREEN</td>
¡¡¡¡¡¡¡¡¡¡¡¡¡¡<td colspan=3 align=center bgcolor="#000ff">BLUE</td>
¡¡¡¡¡¡¡¡¡¡¡¡</tr>
¡¡¡¡¡¡¡¡¡¡¡¡<tr>
¡¡¡¡¡¡¡¡¡¡¡¡¡¡<td><input type=button name=rm value="<" onclick = "color(this.form, 'Red' , -1);"></td>
¡¡¡¡¡¡¡¡¡¡¡¡¡¡<td><input type=button name=Red value="33" onclick = "setval(this);"></td>
¡¡¡¡¡¡¡¡¡¡¡¡¡¡<td><input type=button name=rp value=">" onclick = "color(this.form, 'Red', 1);"></td>
¡¡¡¡¡¡¡¡¡¡¡¡¡¡<td><input type=button name=gm value="<" onclick = "color(this.form, 'Green', -1);"></td>
¡¡¡¡¡¡¡¡¡¡¡¡¡¡<td><input type=button name=Green value="66" onclick = "setval(this);"></td>
¡¡¡¡¡¡¡¡¡¡¡¡¡¡<td><input type=button name=gp value=">" onclick = "color(this.form, 'Green', 1);"></td>
¡¡¡¡¡¡¡¡¡¡¡¡¡¡<td><input type=button name=bm value="<" onclick = "color(this.form, 'Blue', -1);"></td>
¡¡¡¡¡¡¡¡¡¡¡¡¡¡<td><input type=button name=Blue value="99" onclick = "setval(this);"></td>
¡¡¡¡¡¡¡¡¡¡¡¡¡¡<td><input type=button name=bp value=">" onclick = "color(this.form, 'Blue', 1);"></td>
¡¡¡¡¡¡¡¡¡¡¡¡</tr>
¡¡¡¡¡¡¡¡¡¡</table>