Document Fader

<html>
<head>
    <title>Document Fader</title>
</head>

<body>

<script language="JavaScript" type="text/javascript">
<!-- Begin
document.bgcolor="#000000"

var hexchars="0123456789ABCDEF";
function fromHex (str) {
var high=str.charAt(0); //Note: Netscape 2.0 bug workaround


var low=str.charAt(1);
return(16*hexchars.indexOf(high))+hexchars.indexOf(low);
}

function Color(str){
    this.r=fromHex(str.substring(0,2));
    this.g=fromHex(str.substring(2,4));
    this.b=fromHex(str.substring(4,6));
    return this;
    }

// Change this value for the starting color ....
col_value="#CCCFFF";
color_start=col_value.substring(1,8);

// Change this value for the ending color ....
col_value="#FC000C";
color_end=col_value.substring(1,8);

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(val) {
    fade(Color(color_start).r,Color(color_start).g,Color(color_start).b,Color(color_end).r,Color(color_end).g,Color(color_end).b,val);
}

/* do fadein */
// Change the value to get the fading time.
// Higher values means slower fading
fadein(380);

// -->
</script>

</body>
</html>