Svårt att förklara men tryck på exempel nedanför så får du se.

Exempel

hexArray = new makearray(16);

for(var i = 0; i < 10; i++) hexArray[i] = i;
hexArray[10]="A"; hexArray[11]="B"; hexArray[12]="C";
hexArray[13]="D"; hexArray[14]="E"; hexArray[15]="F";

function makeHex(i)
{
if (i < 0) return "00";

else if (i > 255) return "FF";

else
return "" + hexArray[Math.floor(i/16)] + hexArray[i%16];
}

function setbgColor(r, g, b)
{
var red = makeHex(r); var green = makeHex(g); var blue = makeHex(b);
document.bgColor = "#"+red+green+blue;
}

function fade(sr, sg, sb, er, eg, eb, inc)
{
// keep updating the background color
for(var i = 0; i <= inc; i++)
{
setbgColor(
Math.floor(sr * ((inc-i)/inc) + er * (i/inc)),
Math.floor(sg * ((inc-i)/inc) + eg * (i/inc)),
Math.floor(sb * ((inc-i)/inc) + eb * (i/inc)));
}
}

// The first six values are RGB color values,
// and can be edited. (Ex. 255,255,255=white,
// 0,0,0=black). The seventh value is a time
// value, which can also be edited. (Ex.
// 1000=1 second).
fade(0,0,0, 255,255,255, 500);

// -->
</script>

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