// CSS Photo Shuffler v1.0 by
  //   Carl Camera
  //   http://iamacamera.org 
  //
  // SetOpacity Function and inpiration from Photo Fade by
  //   Richard Rutter
  //   http://clagnut.com
  //
  // License: Creative Commons Attribution 2.5  License
  //   http://creativecommons.org/licenses/by/2.5/
  //
  
  var gblPhotoShufflerDivId_Left = "foto_new_div_left";
  var gblPhotoShufflerImgId_Left = "foto_new_left";  
  var gblFootShufflerTextId_Left = "foto_new_text_left";  
	
  var gblPhotoShufflerDivId_Right = "foto_new_div_right";
  var gblPhotoShufflerImgId_Right = "foto_new_right";  
  var gblFootShufflerTextId_Right = "foto_new_text_right"; 	
	
  var gblPauseSeconds = 3;
  var gblFadeSeconds =.85;
  var gblRotations = 1000000000;

  // End Customization section
  
  var gblDeckSize = gblImg_Left.length;
  var gblOpacity = 100;
  var TextOpacity = 100;
  var gblOnDeck = 0;
  var gblStartImg_Left;
  var gblStartFoot_Left;
  var gblImageRotations = gblDeckSize * (gblRotations+1); 	
	
	
  window.onload = photoShufflerLaunch;

  function photoShufflerLaunch()
  {
	  	  
  	var theimg_Left = document.getElementById(gblPhotoShufflerImgId_Left);
    gblStartImg_Left = theimg_Left.src; // save away to show as final image
	document.getElementById(gblPhotoShufflerDivId_Left).style.backgroundImage='url(' + gblImg_Left[gblOnDeck] + ')';
	
	var thefoot_Left = document.getElementById(gblFootShufflerTextId_Left);
    gblStartFoot_Left = thefoot_Left.innerHTML; // save away to show as final foot	
	
	
	var theimg_Right = document.getElementById(gblPhotoShufflerImgId_Right);
    gblStartImg_Right = theimg_Right.src; // save away to show as final image
	document.getElementById(gblPhotoShufflerDivId_Right).style.backgroundImage='url(' + gblImg_Right[gblOnDeck] + ')';
	
	var thefoot_Right = document.getElementById(gblFootShufflerTextId_Right);
    gblStartFoot_Right = thefoot_Right.innerHTML; // save away to show as final foot
	
	setTimeout("photoShufflerFade()",gblPauseSeconds*1000);
	
	
	
  }

  function photoShufflerFade()
  {
  	var theimg_Left = document.getElementById(gblPhotoShufflerImgId_Left);
	var thefoot_Left = document.getElementById(gblFootShufflerTextId_Left);
	
	var theimg_Right = document.getElementById(gblPhotoShufflerImgId_Right);
	var thefoot_Right = document.getElementById(gblFootShufflerTextId_Right);
	
  	// determine delta based on number of fade seconds
	// the slower the fade the more increments needed
        var fadeDelta = 100 / (30 * gblFadeSeconds);
		var fadeDeltaText = 100 / (30 * gblFadeSeconds/2);

	// fade top out to reveal bottom image
	if (gblOpacity < 2*fadeDelta ) 
	{
	  gblOpacity = 100;
	  TextOpacity=100;
	  // stop the rotation if we're done
	  if (gblImageRotations < 1) return;
	  photoShufflerShuffle();
	  // pause before next fade
          setTimeout("photoShufflerFade()",gblPauseSeconds*1000);
		  
	}
	else
	{
	  gblOpacity -= fadeDelta;
	  setOpacity(theimg_Left,gblOpacity);	
	  setOpacity(theimg_Right,gblOpacity);	
	  setTimeout("photoShufflerFade()",30);  // 1/30th of a second
	}
	
	
	if (gblOpacity<=50) 
	{		
		TextOpacity +=fadeDeltaText;	
		
		//if((gblImageRotations<gblDeckSize * (gblRotations+1)) && (gblFoot_Left[gblOnDeck]!=gblFoot_Left[gblOnDeck-1] && gblOnDeck!=gblFoot_Left.length ) ){			
		if((gblOnDeck+1)%2==0){		
			thefoot_Left.innerHTML=gblFoot_Left[gblOnDeck];
			setOpacity(thefoot_Left,TextOpacity);	
		}		
		if((gblOnDeck)%2==0 && (gblDeckSize * (gblRotations+1)-gblImageRotations)>0){			
			thefoot_Right.innerHTML=gblFoot_Right[gblOnDeck]; 
			setOpacity(thefoot_Right,TextOpacity);	
		}
	  // stop the rotation if we're done
	 
	}
	else
	{
	  TextOpacity -=fadeDeltaText;	
		if((gblOnDeck+1)%2==0){	
		setOpacity(thefoot_Left,TextOpacity);	
	  }	 
	  if((gblOnDeck)%2==0 && (gblDeckSize * (gblRotations+1)-gblImageRotations)>0){		
		setOpacity(thefoot_Right,TextOpacity);	
	  }
	}
	
	
  }

  function photoShufflerShuffle()
  {
	var thediv_Left = document.getElementById(gblPhotoShufflerDivId_Left);
	var theimg_Left = document.getElementById(gblPhotoShufflerImgId_Left);
	
	// copy div background-image to img.src
	theimg_Left.src = gblImg_Left[gblOnDeck];
	// set img opacity to 100
	setOpacity(theimg_Left,100);
	
	var thediv_Right= document.getElementById(gblPhotoShufflerDivId_Right);
	var theimg_Right = document.getElementById(gblPhotoShufflerImgId_Right);
	
	// copy div background-image to img.src
	theimg_Right.src = gblImg_Right[gblOnDeck];
	// set img opacity to 100
	setOpacity(theimg_Right,100);


        // shuffle the deck
	gblOnDeck = ++gblOnDeck % gblDeckSize;
	// decrement rotation counter
	if (--gblImageRotations < 1)
	{
	  // insert start/final image if we're done
	  gblImg_Left[gblOnDeck] = gblStartImg_Left;
	  gblFoot_Left[gblOnDeck] = gblFootImg_Left;
	  
	  gblImg_Right[gblOnDeck] = gblStartImg_Right;
	  gblFoot_Right[gblOnDeck] = gblFootImg_Right;
	}

	// slide next image underneath
	thediv_Left.style.backgroundImage='url(' + gblImg_Left[gblOnDeck] + ')';
	thediv_Right.style.backgroundImage='url(' + gblImg_Right[gblOnDeck] + ')';
  }

  function setOpacity(obj, opacity) {
    opacity = (opacity == 100)?99.999:opacity;
    
    // IE/Win
    obj.style.filter = "alpha(opacity:"+opacity+")";
    
    // Safari<1.2, Konqueror
    obj.style.KHTMLOpacity = opacity/100;

    // Older Mozilla and Firefox
    obj.style.MozOpacity = opacity/100;

    // Safari 1.2, newer Firefox and Mozilla, CSS3
    obj.style.opacity = opacity/100;
  }