// IXF1.0 :: Image cross-fade 
// *****************************************************
// DOM scripting by brothercake -- http://www.brothercake.com/
//******************************************************
//global object
var ixw = { 'clock' : null, 'count' : 1 }
//  EDITED FILE FROM ORIGINAL TO SUPPORT MY IMAGES.
//  PLEASE SEE www.brothercake.com for original source.

//crosswipe setup function
function crosswipe()
{
   //if the timer is not already going
   if(ixw.clock == null)
   {
      //copy the image object 
      ixw.obj = arguments[0];
      
      //get its dimensions
      ixw.size = { 'w' : ixw.obj.width, 'h' : ixw.obj.height };
      
      //copy the image src argument 
      ixw.src = arguments[1];
      
      //change the image alt text if defined
      if(typeof arguments[4] != 'undefined' && arguments[4] != '')
      {
         ixw.obj.alt = arguments[4];
      }

      //if dynamic element creation is supported
      if(typeof document.createElementNS != 'undefined' || typeof document.createElement != 'undefined')
      {
         //create a new image object and append it to body
         //detecting support for namespaced element creation, in case we're in the XML DOM
         ixw.newimg = document.getElementsByTagName('body')[0].appendChild((typeof document.createElementNS != 'undefined') ? document.createElementNS('http://www.w3.org/1999/xhtml', 'img') : document.createElement('img'));

         //set positioning classname
         ixw.newimg.className = 'idupe';

         //set src to new image src
         ixw.newimg.src = ixw.src

         //move it to superimpose original image
         ixw.newimg.style.left = ixw.getRealPosition(ixw.obj, 'x') + 'px';
         ixw.newimg.style.top = ixw.getRealPosition(ixw.obj, 'y') + 'px';

         //set it to be completely hidden with clip
         ixw.newimg.style.clip = 'rect(0, 0, 0, 0)';

         //show the image 
         ixw.newimg.style.visibility = 'visible';

         //copy and convert fade duration argument 
         ixw.length = parseInt(arguments[2], 10) * 1000;

         //create fade resolution argument as 20 steps per transition
         ixw.resolution = parseInt(arguments[2], 10) * 20;

         //copy slide direction argument
         ixw.dir = arguments[3];

         //start the timer
         ixw.clock = setInterval('ixw.crosswipe()', ixw.length/ixw.resolution);
      }
      
      //otherwise if dynamic element creation is not supported
      else
      {
         //just do the image swap
         ixw.obj.src = ixw.src;
      }
      
   }
};


//crosswipe timer function
ixw.crosswipe = function()
{
   //decrease the counter on a linear scale
   ixw.count -= (1 / ixw.resolution);
   
   //if the counter has reached the bottom
   if(ixw.count < (1 / ixw.resolution))
   {
      //clear the timer
      clearInterval(ixw.clock);
      ixw.clock = null;
      
      //reset the counter
      ixw.count = 1;
      
      //set the original image to the src of the new image
      ixw.obj.src = ixw.src;
   }
   
   //animate the clip of the new image
   //using the width and height properties we saved earlier
   ixw.newimg.style.clip = 'rect('
      + ( (/bt|bltr|brtl/.test(ixw.dir)) ? (ixw.size.h * ixw.count) : (/che|cc/.test(ixw.dir)) ? ((ixw.size.h * ixw.count) / 2) : (0) )
      + 'px, '
      + ( (/lr|tlbr|bltr/.test(ixw.dir)) ? (ixw.size.w - (ixw.size.w * ixw.count)) : (/cve|cc/.test(ixw.dir)) ? (ixw.size.w - ((ixw.size.w * ixw.count) / 2)) : (ixw.size.w) )
      + 'px, '
      + ( (/tb|tlbr|trbl/.test(ixw.dir)) ? (ixw.size.h - (ixw.size.h * ixw.count)) : (/che|cc/.test(ixw.dir)) ? (ixw.size.h - ((ixw.size.h * ixw.count) / 2)) : (ixw.size.h) )
      + 'px, '
      + ( (/lr|tlbr|bltr/.test(ixw.dir)) ? (0) : (/tb|bt|che/.test(ixw.dir)) ? (0) : (/cve|cc/.test(ixw.dir)) ? ((ixw.size.w * ixw.count) / 2) : (ixw.size.w * ixw.count) ) 
      + 'px)';
         
   //keep new image in position with original image
   //in case text size changes mid transition or something
   ixw.newimg.style.left = ixw.getRealPosition(ixw.obj, 'x') + 'px';
   ixw.newimg.style.top = ixw.getRealPosition(ixw.obj, 'y') + 'px';
   
   //if the counter is at the top, which is just after the timer has finished
   if(ixw.count == 1)
   {
      //remove the duplicate image
      ixw.newimg.parentNode.removeChild(ixw.newimg);
   }
};



//get real position method
ixw.getRealPosition = function()
{
   this.pos = (arguments[1] == 'x') ? arguments[0].offsetLeft : arguments[0].offsetTop;
   this.tmp = arguments[0].offsetParent;
   while(this.tmp != null)
   {
      this.pos += (arguments[1] == 'x') ? this.tmp.offsetLeft : this.tmp.offsetTop;
      this.tmp = this.tmp.offsetParent;
   }
   
   return this.pos;
};