/* ********************************************************************
* Buffered Text-fade Effect - v3.0
* - Copyright 2008 - Licenced for free distribution under the BSDL
*   - http://www.opensource.org/licenses/bsd-license.php
*
*   This program is licenced under the BSDL and may be distributed far
* and wide, anywhere on the planet and beyond (maybe!)  If you happen
* to get a kick out of this script, please drop me a note at:
* wyvern@greywyvern.com and tell me where you gave it a good home and
* plenty of bytes to eat, hmmm? :)  I'd be eternally grateful.
* 
* - To have links fade along with with the surrounding text, apply
* the CSS style: color:inherit !important; to all links within the fade
* text messages.
* 
* - If you're placing the fading text on a background image, make
* the starting colour an average sample of the background instead of
* just black or white.  This will enhance the "disappearing" effect.
*
* fader[0] = new fadeObj('fade0', 'dddddd', '000000', 20, 20);
*
*   The first argument ('fade0') is the id of the HTML tag which will
* be displaying the fading effect.  Usually you'll want to apply some
* height and width styles to this element, since it starts out with no
* text by default and will probably be collapsed.  You don't want it
* jumping around when the script writes new text to it.
*
*   The next two values are hexidecimal colour values, WITHOUT the
* preceding #.  The first value is the starting colour, or the colour
* the text is before it fades in.  The second value is the ending
* colour, or the colour the text will be when it finishes fading in.
*
*   The last two values are two integers which indicate the number of
* "steps" the script must take to complete a fade-in and a fade-out
* respectively.  With a value of 20 like in the example above, there
* will be 20 colour changes before the text is fully faded-in or faded-
* out.  The lower these numbers, the faster the fade will be.
*
* 
* 
* http://www.greywyvern.com/javascript.php
***********************************************************************

/* ***** Begin ***************************************************** */
function fadeObject(id, c1, c2, s1, s2) {
  var self = this;
  this.id      = id;
  this.elem    = false;
  this.colour  = {
    stt: [parseInt(c1.substr(0, 2), 16), parseInt(c1.substr(2, 2), 16), parseInt(c1.substr(4, 2), 16)],
    end: [parseInt(c2.substr(0, 2), 16), parseInt(c2.substr(2, 2), 16), parseInt(c2.substr(4, 2), 16)],
    now: [parseInt(c1.substr(0, 2), 16), parseInt(c1.substr(2, 2), 16), parseInt(c1.substr(4, 2), 16)]
  };
  this.steps   = [s1, s2];
  this.dir     = false;
  this.active  = false;
  this.queue   = [];
  this.msg     = [];
  this.message = 0;
  function d2h(num) {
    num = Math.round(num);
    return ((num < 16) ? "0" : "") + num.toString(16);
  }
  this.fade = function(message, direction) {
    this.elem = this.elem || document.getElementById(this.id);
    this.queue.push([message, direction]);
    for (var x = 0; x < this.queue.length; x++) {
      for (var y = x + 1; y < this.queue.length; y++) {
        if (this.queue[x][0] == this.queue[y][0] && this.queue[x][1] != this.queue[y][1]) {
          this.queue.splice(x, 1);
          this.queue.splice(y - 1, 1);
        }
      }
    }
    if (!this.active) setTimeout(function() { self.fadeLoop(); }, 0);
  };
  this.fadeLoop = function() {
    if (!this.active && this.queue.length) {
      if (this.dir && this.message != this.queue[0][0]) this.queue.unshift([this.message, false]);
      var msg = this.queue.shift();
      if (this.msg[msg[0]]) {
        this.active = true;
        this.elem.innerHTML = this.msg[this.message = msg[0]];
        this.dir = msg[1];
      }
    }
    if (this.dir) {
      var c1 = this.colour.stt, c2 = this.colour.end, s = this.steps[0];
    } else var c1 = this.colour.end, c2 = this.colour.stt, s = this.steps[1];
    for (var x = 0, cnow = "", inc = 0; x < 3; x++) {
      this.colour.now[x] += inc = (c2[x] - c1[x]) / s;
      cnow += this.colour.now[x] = (inc < 0) ? Math.max(this.colour.now[x], c2[x]) : Math.min(this.colour.now[x], c2[x]);
    } this.elem.style.color = "#" + d2h(this.colour.now[0]) + d2h(this.colour.now[1]) + d2h(this.colour.now[2]);
    if (cnow == c2.join("")) {
      this.active = false;
      if (!this.queue.length) {
        if (!this.dir) {
          if (this.msg[0]) {
            this.queue.push([0, true]);
            setTimeout(function() { self.fadeLoop(); }, 0);
          } else this.elem.innerHTML = "&nbsp;";
        }
      } else setTimeout(function() { self.fadeLoop(); }, 0);
    } else setTimeout(function() { self.fadeLoop(); }, 0);
  };
  if (window.addEventListener) {
   // window.addEventListener('load', function() { self.fade(0, true); }, false); 
  } else if (window.attachEvent) {
    // window.attachEvent('onload', function() { self.fade(0, true); });
  }
}
/* ***** End ******************************************************* */

var hash = new Array();
function throb(item, keepfading) {

  // If the hash array does not have an entry for this item, initialise it at 2
  if (!hash[item]) hash[item] = 2;

  // Send a fade command using the hash array to tell us what parameters we should use
  fader[item].fade(Math.floor(hash[item] / 2), !(hash[item] % 2));

  // Call this function again for this same item after a certain amount of time
  //job@insyde.nl: added parameter keepfading, changed 100 to 1000 to have some time between fades
  if (keepfading)
  {
  	setTimeout(function() { throb(item, true); }, (hash[item] % 2) ? 1000 : 45000);
  }

  // If we have exceeded the number of messages in this fader, start over again at 2
  if (++hash[item] > fader[item].msg.length * 2 - 1) hash[item] = 2;
}