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Background Changer in JavaScript

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Special Effects using JavaScript
Background Changer using JavaScript
Make yourself a flashy and colorful entrance to your web page with this script.
(*Note: Does not work in MSIE 5.0 - ???).
This script has two parts that both reside between the <HEAD> and the </HEAD> tags but make note to place them AFTER the <TITLE> and the </TITLE> tags not before like most scripts. Placing them in your document before these tags may cause problems.
Do it like so:

<HEAD>
<TITLE>My Title</TITLE>
<SCRIPT LANGUAGE="JavaScript">
</SCRIPT>
</HEAD>

It looks like this:

<HTML>

<HEAD>

<TITLE>Background Changer in JavaScript</TITLE>

function initArray() 
{
  this.length = initArray.arguments.length
  for (var i = 0; i < this.length; i++)
    this[i+1] = initArray.arguments[i]
}

var hexChars = "0123456789ABCDEF";

function Dec2Hex (Dec) 
{
  var a = Dec % 16;
  var b = (Dec - a)/16;
  hex = "" + hexChars.charAt(b) + hexChars.charAt(a);
  return hex;
}

function bgChanger (begin, end, steps) 
{
  steps = steps -1 ;

redA     = begin.charAt(0) + begin.charAt(1);
  red_valA = parseInt(redA,'16');
  redB     = end.charAt(0) + end.charAt(1);
  red_valB = parseInt(redB,'16');
  red_int  = ((red_valB - red_valA) / steps) * -1;
  grnA     = begin.charAt(2) + begin.charAt(3);
  grn_valA = parseInt(grnA,'16');
  grnB     = end.charAt(2) + end.charAt(3);
  grn_valB = parseInt(grnB,'16');
  grn_int  = ((grn_valB - grn_valA) / steps) * -1;
  bluA     = begin.charAt(4) + begin.charAt(5);
  blu_valA = parseInt(bluA,'16');
  bluB     = end.charAt(4) + end.charAt(5);
  blu_valB = parseInt(bluB,'16');
  blu_int  = ((blu_valB - blu_valA) / steps) * -1;

step = 2;
  red = red_valA;
  grn = grn_valA;
  blu = blu_valA;

document.bgColor = begin;

while ( steps >= step ) 
  {
    red -= red_int;
    red_round = Math.round(red);
    red_hex = Dec2Hex(red);

grn -= grn_int;
    grn_round = Math.round(grn);
    grn_hex = Dec2Hex(grn);

blu -= blu_int;
    blu_round = Math.round(blu);
    blu_hex = Dec2Hex(blu);

document.bgColor = red_hex + grn_hex + blu_hex;

step++;
  }
  document.bgColor = end;
}

</script>

</script>

</head>

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  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
  })(window,document,'script','//www.google-analytics.com/analytics.js','ga');

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  ga('send', 'pageview');

</script>
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