var isNS = (navigator.appName == "Netscape");
layerRef = (isNS) ? "document" : "document.all";
styleRef = (isNS) ? "" : ".style";
	
var queue = new Array();
var NUM_OF_TRAIL_PARTS = 6

for (x=1; x < 7; x++) {	 ///////////////Image Preload
	eval("trailSpriteFrame" + x + " = new Image(10,10);");
	eval("trailSpriteFrame" + x + ".src = 'trailgif" + x + ".gif';");
}

////////////////////////////////////////////////The trail Object

function trailSpriteObj(anID) {
	this.trailSpriteID = "trailSprite" + anID; //as before 
	this.imgRef = "trailSprite" + anID + "img"; //reference to the sprites image name
	this.currentFrame = 1; //the varible for looking after the frame
	this.animateTrailSprite = animateTrailSprite; //declare the objects method cycle
}

function animateTrailSprite() {
	if (this.currentFrame <7) {	//if there are animation frames left, the change sprites the current frame
		if (isNS) { 			//Detect the browser and perform coresponding image switch
			eval("document['"+ this.imgRef + "'].src  =  trailSpriteFrame" + this.currentFrame + ".src");
		} else {
			eval("document['" + this.imgRef + "'].src  =  trailSpriteFrame" + this.currentFrame + ".src");
		}
		this.currentFrame ++; 	//and increase the objects current frame 
	} else { 					//the current frame has reached its limit so hide the sprite
		eval(layerRef + '.' + this.trailSpriteID +  styleRef + '.visibility = "hidden"');
	}	
}

/////////////////////////////////////////////////////////////////

function processAnim() {
	for(x=0; x < NUM_OF_TRAIL_PARTS; x++)
		queue[x].animateTrailSprite();
}

function processMouse(e) {
	currentObj = shuffleQueue();
	if (isNS) {
		eval("document." + currentObj + ".left = e.pageX - 0 ;");
		eval("document." + currentObj + ".top = e.pageY + 5;");
	} else {
		eval("document.all." + currentObj + ".style.pixelLeft = event.clientX + document.body.scrollLeft - 0 ;");
		eval("document.all." + currentObj + ".style.pixelTop = event.clientY + document.body.scrollTop + 5;");
	}
}

function shuffleQueue() {
	lastItemPos = queue.length - 1;
	lastItem = queue[lastItemPos];
	for (i = lastItemPos; i>0; i--) 
		queue[i] = queue[i-1];
	queue[0] = lastItem;
		
	queue[0].currentFrame = 1;	//reset the objects frame number & make the sprite visible again
	eval(layerRef + '.' + queue[0].trailSpriteID +  styleRef + '.visibility = "visible"');	
	
	return 	queue[0].trailSpriteID;
}

function init() {
	for(x=0; x<NUM_OF_TRAIL_PARTS; x++) 	//fill array with trail objects
		queue[x] = new trailSpriteObj(x+1) ;
	
	if (isNS) { document.captureEvents(Event.MOUSEMOVE); }
	document.onmousemove = processMouse;

	setInterval("processAnim();",25);
}

if (version > 3)
	window.onload = init;