var backColor = new Array();

backColor[0] = '#4E587E';
backColor[1] = '#6B6105';
backColor[2] = '#4a4c57';
backColor[3] = '#6e6426';
backColor[4] = '#5f6800';
backColor[5] = '#434343';
backColor[6] = '#a64d80';
backColor[7] = '#ff0500';
backColor[8] = '#630025';
backColor[9] = '#4f6ba9';
backColor[10] = '#5a6996';
backColor[11] = '#0095a6';
backColor[12] = '#a65100';

backColor[13] = '#00E135';
backColor[14] = '#05326B';
backColor[15] = '#3C6B05';

backColor[16] = '#FB4141';
backColor[17] = '#4199FB';
backColor[18] = '#7A41FB';
backColor[19] = '#6BF2FE';
backColor[20] = '#4a4c57';

function changeBG(whichColor){
document.bgColor = backColor[whichColor];
}