See this for the code that I have managed to find.
<form>
<font size=5>Colour Scheme</font>
<input type="button"
STYLE="font-size:14; background-color:ffcc00; color:000000"
value="Black on Yellow"
onClick="document.bgColor = '#FFCC00';document.fgColor='#000000';">
<input type="button"
STYLE="font-size:14; background-color:000000; color:FFCC00"
value="Yellow on Black"
onClick="document.bgColor = '#000000';document.fgColor='#FFCC00';">
<input type="button"
STYLE="font-size:14; background-color:00FF00; color:000000"
value="Black on Green"
onClick="document.bgColor = '#00FF00';document.fgColor='#000000';">
<input type="button"
STYLE="font-size:14; background-color:000000; color:00FF00"
value="Green on Black"
onClick="document.bgColor = '#000000';document.fgColor='#00FF00';">
<input type="button"
STYLE="font-size:14; background-color:FFFFFF; color:000000"
value="Black on White"
onClick="document.bgColor = '#FFFFFF';document.fgColor='#000000';">
<input type="button"
STYLE="font-size:14; background-color:000000; color:FFFFFF"
value="White on black"
onClick="document.bgColor = '#000000';document.fgColor='#FFFFFF';">
</form>
As you can see, more can be added with nothing more than the html colour codes for the combinations that are being requested. Works perfectly. Just waiting for the opinion of the members of the club I am building the site for