// =======================================
// The following vars should be defined and initialized prior to this script being loaded
//   iFirstChangeSpeed ..... speed of initial slide change (milliseconds)
//   iSlideShowSpeed ....... speed of subsequent slide changes (milliseconds)
//   iCrossFadeDuration .... duration of crossfade (seconds)
//   iImageTagCount ........ count of image tags to randomly cycle
//   aImageFileName ........ array of image names to cycle through
var i;
var iImageCount = aImageFileName.length;
var aPreLoadedImage = new Array();
for (i = 0; i < iImageCount; i++) {
	aPreLoadedImage[i] = new Image();
	aPreLoadedImage[i].src = aImageFileName[i];
	}
var aSlideCurrentImage = new Array();
for (i = 0; i < iImageTagCount; i++) {
	aSlideCurrentImage[i] = i;
	}
var iPreviousSlideFlipped = 99;
// =======================================
if(document.all && !document.getElementById) {
	document.getElementById = function(id) { return document.all[id]; }
	}
// =======================================
function iRandomNum(iMinVal, iMaxVal) {
    var iRanNum = Math.floor(Math.random() * (iMaxVal - iMinVal + 1)) + iMinVal;
   	return iRanNum;
	}

function imageAlreadyShowing(iNumToCheck) {
	for (i = 0; i < iImageTagCount; i++) {
		if (aSlideCurrentImage[i] == iNumToCheck) return true;
		}
	return false;
	}

function flipOneSlide(iSlideNum) {
	var sSlideID = "slide" + iSlideNum;
	var iNewImageNum;
	do { iNewImageNum = iRandomNum(0, iImageCount - 1) } while (imageAlreadyShowing(iNewImageNum));
	document.getElementById(sSlideID).style.filter = "blendTrans(duration=iCrossFadeDuration)";
	document.getElementById(sSlideID).filters.blendTrans.Apply();
	document.getElementById(sSlideID).src = aPreLoadedImage[iNewImageNum].src;
	document.getElementById(sSlideID).filters.blendTrans.Play();
	aSlideCurrentImage[iSlideNum] = iNewImageNum;
	iPreviousSlideFlipped = iSlideNum;
	}
	
function runSlideShow() {
	var iSlideToFlip;
	do { iSlideToFlip = iRandomNum(0, iImageTagCount - 1) } while (iSlideToFlip == iPreviousSlideFlipped);
	flipOneSlide(iSlideToFlip);
	i = setTimeout('runSlideShow()', iSlideShowSpeed);
	}