function makearray(n) {
	this.length = n;
    for(var i = 1; i <= n; i++)
    this[i] = 0;
    return this;
}
    hexa = new makearray(16);
    for(var i = 0; i < 10; i++)
    hexa[i] = i;
    hexa[10]="a"; hexa[11]="b"; hexa[12]="c";
    hexa[13]="d"; hexa[14]="e"; hexa[15]="f";

function hex(i) {
	if (i < 0)
    return "00";
    else if (i > 255)
    return "ff";
    else
    return "" + hexa[Math.floor(i/16)] + hexa[i%16];
}

function setbgColor(r, g, b) {
	var hr = hex(r); var hg = hex(g); var hb = hex(b);
    document.bgColor = "#"+hr+hg+hb;
    }

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

function fadein() {
	fade(255,255,255, 0,0,0, 100);
}
fadein();