// Custom javascript/php for index page slide show.
//


var rememberSlides = 0;
var randomSlides = false;
var repeatTitle = 7;

var PI = Math.PI;
var twoPI = PI * 2; 
var rads = [PI,0];
var increment = twoPI / 200;
var initOpacity =[100,0];
var started = [0,1];
var intervalID;
var i, j, k, x, y;
var titleX, titleY;
var rangeX, rangeY;
var jumpX, jumpY;
var lastX, lastY;
var sourceArray = [];
var slideArray = [];
var slideQueue = [];
var recentSlides = [];

var box = new Object();
var delay;


var slidePath = "annonces/";
var slideName = "";
var slideType = ".jpg";
var slideCount = 9;

function loadShow(bW, bH, bT, dT, startTitle, alt, tX, tY)
	{
	 box.width = bW;
	 box.height = bH;
	 box.top = bT;
	 box.bottom = box.top + box.height;
	 delay = dT;
	 titleX = tX;
	 titleY = tY;
 	 j=0;
	
	 if (document.images)
		{
		 sourceArray[0] = "annonces/1.jpg";
		 sourceArray[1] = "annonces/2.jpg";
		 sourceArray[2] = "annonces/3.jpg";
		 sourceArray[3] = "annonces/4.jpg";
		 sourceArray[4] = "annonces/5.jpg";
		 sourceArray[5] = "annonces/6.jpg";
		 sourceArray[6] = "annonces/7.jpg";
		 sourceArray[7] = "annonces/8.jpg";
		 sourceArray[8] = "annonces/9.jpg";
		}

	 slideArray = sourceArray.slice();
	 recentSlides.length = rememberSlides;

	 if (startTitle)
	 	{
		 document.titleSlide = new Image();
		 document.titleSlide.src = startTitle;
		 slideQueue[0] = document.titleSlide;
		 started[0] = 1;
		}
	 
	 j = slideCount - 1;
	 for (i=started[0]; i<3; i++)
	 	{
		 if(randomSlides)
		 	{j = Math.floor(Math.random() * slideArray.length);}
		 document["slide"+j] = new Image();
//		 document["slide"+j].src = slidePath + slideName + slideArray[j] + slideType;
		 document["slide"+j].src = slideArray[j];
		 slideQueue[i] = document["slide"+j];
		 if(!randomSlides)
		 	{slideArray.push(slideArray[j]);}
		 slideArray.splice(j,1);
		 if(slideArray.length == 0)
			{slideArray = sourceArray.slice();}
		 recentSlides.shift();
		 recentSlides.push(slideArray[j]);
		 j = 0; //started[0] = 1;
		}

	 document.write("<DIV ID=\"smartshow\" STYLE=\"width: " + box.width + "px; height: " + box.height + "px; overflow: hidden; position: relative;\">\n");
	 document.write("<IMG NAME=\"frame0\" SRC=\"" + slideQueue[0].src + "\" CLASS=\"frame0\" ALT=\"" + alt + "\" BORDER=0><BR>\n");
	 document.write("<IMG NAME=\"frame1\" SRC=\"" + slideQueue[1].src + "\" CLASS=\"frame1\" ALT=\"" + alt + "\" BORDER=0><BR>\n");
	 document.write("</DIV>\n");
	 
	 for (i=0; i<2; i++)
	 	{
		 document["frame"+i].style.position = "absolute";
		 document["frame"+i].style.filter = "alpha(opacity=" + initOpacity[i] * started[i] + ")";
		 document["frame"+i].style.opacity = initOpacity[i] / 100 * started[i];
		 document["frame"+i].style.zoom = 1;
		}

	 if (startTitle)
	 	{
		 document.frame0.style.left = titleX + "px";
		 document.frame0.style.top = titleY + "px";
		}
	}

function startShow()
	{
	 k = 0;
	 lastX = lastY = 0;
	 newSlide(1);
	 intervalID = setInterval("changeOpacity()", delay);
	}

function changeOpacity()
	{
	 for (i=0 ; i<2 ; i++)
	 	{
	 	 var opacity = (60 * -(Math.cos(rads[i])) + 60) * started[i];

		 document["frame"+i].style.filter = "alpha(opacity="+opacity+")";
		 document["frame"+i].style.opacity = opacity / 100;
	 
		 rads[i] += increment;
		 
		 if (rads[i] > twoPI) 
			{
			 started[i]=1;
			 newSlide(i);	
			 rads[i] = 0;
			}
		}
	}

function newSlide(i)
	{
	 j=0;
	 if (k == repeatTitle && document.titleSlide)
	 	{
		 k = 0;
		 document["frame"+i].src = document.titleSlide.src;
		 x = titleX;
		 y = titleY;
		}
	 else
		{ 
		 var YHeight, YScroll, YTotal;
		 if(navigator.appVersion.match("MSIE"))
			{
			 YHeight = document.body.clientHeight;
			 YScroll = document.body.scrollTop;
			}
		 else
			{
			 YHeight = window.innerHeight;
			 YScroll = window.pageYOffset;
			}
		 YTotal = YHeight + YScroll;

		 box.above = (YScroll - box.top) * (YScroll > box.top) * (box.top > 0);
		 box.below = (box.bottom - YTotal) * (box.bottom > YTotal) * (box.top > 0);
		 box.showing = box.height - (box.above + box.below);
		 
		 if(randomSlides)
			{
			 do {j = Math.floor(Math.random() * slideArray.length);}
			 while (recentSlides.indexOf(slideArray[j]) != -1);
			}

		 if(!document["slide"+slideArray[j]])
		 	{
		 	 document["slide"+slideArray[j]] = new Image();
//		 	 document["slide"+slideArray[j]].src = slidePath + slideName + slideArray[j] + slideType;
		 	 document["slide"+slideArray[j]].src = slideArray[j];
			}

		 slideQueue.shift();
		 slideQueue.push(document["slide"+slideArray[j]]);

		 recentSlides.shift();
		 recentSlides.push(slideArray[j]);

		 if(!randomSlides)
		 	{slideArray.push(slideArray[j]);}
		 slideArray.splice(j,1);
		 if(slideArray.length == 0)
			{slideArray = sourceArray.slice();}

		 document["frame"+i].src = slideQueue[0].src;

		 rangeX = box.width - slideQueue[0].width;
		 rangeY = box.showing - slideQueue[0].height;
		 jumpX = Math.floor(rangeX/8);
		 jumpY = Math.floor(rangeY/4);
		 
		 do {x = Math.floor(Math.random() * rangeX);}
		 while (Math.abs(lastX - x) < jumpX);
		 
		 do {y = Math.floor(Math.random() * rangeY);}
		 while (Math.abs(lastY - y) < jumpY);
		 
		 lastX = x; lastY = y;
		}

	 y += box.above;

	 document["frame"+i].style.left = x + "px";
	 document["frame"+i].style.top = y + "px";

	 k++;
	}

// To make Array.indexOf work in Explorer

//This prototype is provided by the Mozilla foundation and
//is distributed under the MIT license.
//http://www.ibiblio.org/pub/Linux/LICENSES/mit.license

// Courtesy of http://www.hunlock.com/blogs/Mastering_Javascript_Arrays

if (!Array.prototype.indexOf)
{
  Array.prototype.indexOf = function(elt /*, from*/)
  {
    var len = this.length;

    var from = Number(arguments[1]) || 0;
    from = (from < 0)
         ? Math.ceil(from)
         : Math.floor(from);
    if (from < 0)
      from += len;

    for (; from < len; from++)
    {
      if (from in this &&
          this[from] === elt)
        return from;
    }
    return -1;
  };
}