//
  // 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/
  //

  // Customize your photo shuffle settings
  // 
  // * Surround the target <img /> with a <div>. specify id= in both
  // * set background-repeat:no-repeat in CSS for the div
  // * The first and final photo displayed is in the html <img> tag
  // * The array contains paths to photos you want in the rotation. 
  //   If you want the first photo in the rotation, then it's best to
  //   put it as the final array image.  All photos must be same dimension
  // * The rotations variable specifies how many times to repeat array.
  //   images. zero is a valid rotation value.

  var gblPhotoShufflerDivId = "photodiv";
  var gblPhotoShufflerImgId = "photoimg";
  var gblImgSchool = 12;
  var gblImgEvent = 16;
  var gblImgOverseas = 27;
  var gblImgPlateau = 15;
  var gblImgSki = 10;
  var gblImgSports = 15;
  var gblImgTsukikage = 25;
  var gblImgRisshi = 10;
  var gblImgMath = 12;
  var gblImgOutside = 16;
  var gblImgNumber = gblImgSchool + gblImgEvent;
  var gblImg = new Array();

  // Image Folder Search
  for(i=0; i<gblImgSchool; i++) {
	var n=i+1
	if(n<10) {
		gblImg[i] = "schoolimg/b_img0" + n + ".jpg";
	} else {
		gblImg[i] = "schoolimg/b_img" + n + ".jpg";
	}
  }
  for(i=gblImgSchool; i<gblImgNumber; i++) {
	var n = i - gblImgSchool + 21;
	gblImg[i] = "schoolimg/b_img" + n + ".jpg";
  }

  // Img Event of Overseas
  for(i=1; i<=gblImgOverseas; i++) {
	var n=gblImgNumber + i-1;
	if(i<10) {
		gblImg[n] = "event/2010/overseas/b_img0" + i + ".jpg";
	} else {
		gblImg[n] = "event/2010/overseas/b_img" + i + ".jpg";
	}
  }
  gblImgNumber = gblImgNumber + gblImgOverseas;

  // Img Event of Plateau
  for(i=1; i<=gblImgPlateau; i++) {
	var n=gblImgNumber + i-1;
	if(i<10) {
		gblImg[n] = "event/2010/plateau/b_img0" + i + ".jpg";
	} else {
		gblImg[n] = "event/2010/plateau/b_img" + i + ".jpg";
	}
  }
  gblImgNumber = gblImgNumber + gblImgPlateau;

  // Img Event of Ski
  for(i=1; i<=gblImgSki; i++) {
	var n=gblImgNumber + i-1;
	if(i<10) {
		gblImg[n] = "event/2010/ski/b_img0" + i + ".jpg";
	} else {
		gblImg[n] = "event/2010/ski/b_img" + i + ".jpg";
	}
  }
  gblImgNumber = gblImgNumber + gblImgSki;

  // Img Event of Sports
  for(i=1; i<=gblImgSports; i++) {
	var n=gblImgNumber + i-1;
	if(i<10) {
		gblImg[n] = "event/2009/sports/b_img0" + i + ".jpg";
	} else {
		gblImg[n] = "event/2009/sports/b_img" + i + ".jpg";
	}
  }
  gblImgNumber = gblImgNumber + gblImgSports;

  // Img Event of Tsukikage
  for(i=1; i<=gblImgTsukikage; i++) {
	var n=gblImgNumber + i-1;
	if(i<10) {
		gblImg[n] = "event/2010/tsukikage/b_img0" + i + ".jpg";
	} else {
		gblImg[n] = "event/2010/tsukikage/b_img" + i + ".jpg";
	}
  }
  gblImgNumber = gblImgNumber + gblImgTsukikage;

  // Img Event of Risshi
  for(i=1; i<=gblImgTsukikage; i++) {
	var n=gblImgNumber + i-1;
	if(i<10) {
		gblImg[n] = "event/2010/risshi/b_img0" + i + ".jpg";
	} else {
		gblImg[n] = "event/2010/risshi/b_img" + i + ".jpg";
	}
  }
  gblImgNumber = gblImgNumber + gblImgRisshi;

  // Img Event of Math
  for(i=1; i<=gblImgMath; i++) {
	var n=gblImgNumber + i-1;
	if(i<10) {
		gblImg[n] = "event/2010/math/b_img0" + i + ".jpg";
	} else {
		gblImg[n] = "event/2010/math/b_img" + i + ".jpg";
	}
  }
  gblImgNumber = gblImgNumber + gblImgMath;

  // Img Event of Outside
  for(i=1; i<=gblImgOutside; i++) {
	var n=gblImgNumber + i-1;
	if(i<10) {
		gblImg[n] = "event/2010/outside/b_img0" + i + ".jpg";
	} else {
		gblImg[n] = "event/2010/outside/b_img" + i + ".jpg";
	}
  }
  gblImgNumber = gblImgNumber + gblImgOutside;


  var gblPauseSeconds = 5.25;
  var gblFadeSeconds = .85;
  var gblRotations = 100;

  // End Customization section
  
  var gblDeckSize = gblImg.length;
  var gblOpacity = 100;
  var rand = new rangeRandom(0,gblImgNumber-1);
  var gblOnDeck = rand.next();
  var gblStartImg;
  var gblImageRotations = gblDeckSize * (gblRotations+1);

  window.onload = photoShufflerLaunch;
  
  function photoShufflerLaunch()
  {
  	var theimg = document.getElementById(gblPhotoShufflerImgId);
        gblStartImg = theimg.src; // save away to show as final image

	document.getElementById(gblPhotoShufflerDivId).style.backgroundImage='url(' + gblImg[gblOnDeck] + ')';
	setTimeout("photoShufflerFade()",gblPauseSeconds*1000);
  }

  function photoShufflerFade()
  {
  	var theimg = document.getElementById(gblPhotoShufflerImgId);
	
  	// determine delta based on number of fade seconds
	// the slower the fade the more increments needed
        var fadeDelta = 100 / (30 * gblFadeSeconds);

	// fade top out to reveal bottom image
	if (gblOpacity < 2*fadeDelta ) 
	{
	  gblOpacity = 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,gblOpacity);
	  setTimeout("photoShufflerFade()",30);  // 1/30th of a second
	}
  }

  function photoShufflerShuffle()
  {
	var thediv = document.getElementById(gblPhotoShufflerDivId);
	var theimg = document.getElementById(gblPhotoShufflerImgId);
	
	// copy div background-image to img.src
	theimg.src = gblImg[gblOnDeck];
	// set img opacity to 100
	setOpacity(theimg,100);

    // shuffle the deck
	    //gblOnDeck = ++gblOnDeck % gblDeckSize;
	gblOnDeck = rand.next();
	// decrement rotation counter
	if (--gblImageRotations < 1)
	{
	  // insert start/final image if we're done
	  gblImg[gblOnDeck] = gblStartImg;
	}

	// slide next image underneath
	thediv.style.backgroundImage='url(' + gblImg[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;
  }

// ２つの数値の間の乱数を求める
function rangeRandom(num1, num2) {
	if((num1 - num2) > 0) {
		var big = num1;
		var small = num2;
	} else {
		var big = num2;
		var small = num1;
	}
	var range = big - small + 1;
	this.next = function() {
		var number = Math.floor(Math.random()*range) + small;
		return number;
	}
}