This JavaScript fades the background color from one color to another.
This code should be placed immediately after the BODY tag:
<SCRIPT LANGUAGE="JavaScript">
<!-- JavaScript begins...
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)));
}
}
/* Usage:
* fade(inr,ing,inb, outr,outg,outb, step);
* example.
* fade(0,0,0, 255,255,255, 255);
* fade from black to white with very slow speed.
* fade(255,0,0, 0,0,255, 50);
* fade(0xff,0x00,0x00, 0x00,0x00,0xff, 50); // same as above
* step 2 is very fast and step 255 is very slow.
*/
function fadein()
{
fade(255,255,255, 0,0,0, 100);
}
function fadeout()
{
fade(0,0,0, 255,255,255, 100);
}
/* do fadein */
fadein();
// JavaScript ends -->
</SCRIPT>