// JavaScript Document


//cross-Browser Event Handeling
//credits Scott Andrew
function addEvent (elem, evenimentType, functionName, useCapture )
{
	if(elem.addEventListener)
	{
		elem.addEventListener(evenimentType,functionName,useCapture);
		return true;
	}else if (elem.attachEvent)
	{
		var res = elem.attachEvent('on'+evenimentType,functionName);
		return res;
	}else
	{
		elem['on'.evenimentType]=functionName;
		return true;
	}
}

/*===========================GALERY FADE===================*/

function opacity(id, opacStart, opacEnd, millisec) {
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;

	//determine the direction for the blending, if start and end are the same nothing happens
	if(opacStart > opacEnd) {
		for(i = opacStart; i >= opacEnd; i--) {
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	} else if(opacStart < opacEnd) {
		for(i = opacStart; i <= opacEnd; i++)
			{
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	}
}

//change the opacity for different browsers
function changeOpac(opacity, id) {
	var object = document.getElementById(id).style; 
	object.opacity = (opacity / 100);
	object.MozOpacity = (opacity / 100);
	object.KhtmlOpacity = (opacity / 100);
	object.filter = "alpha(opacity=" + opacity + ")";
}

function shiftOpacity(id, millisec) {
	//if an element is invisible, make it visible, else make it ivisible
	if(document.getElementById(id).style.opacity == 0) {
		opacity(id, 0, 100, millisec);
	} else {
		opacity(id, 100, 0, millisec);
	}
}
//========BLEND IMAGES===========================//

function blendImages(divid, imageid,currentImage, nextImage, millisec) {
	var speed = Math.round(millisec / 100);
	var timer = 0;
	
	//set the current image as background
	document.getElementById(divid).style.backgroundImage = "url(" +currentImage.src + ")";
	
	//make image transparent
	changeOpac(0, imageid);
	
	//make new image
	document.getElementById(imageid).src = nextImage.src;

	//fade in image
	for(i = 0; i <= 100; i++) {
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		timer++;
	}
}


//======================GALLERY FUNCTION====================================//
//preload gallery images===========//
	var imgs= new Array();
	var currImg=0;
	var nextImg=1;
	imgs[0]=new Image();
	imgs[1]=new Image();
	imgs[2]=new Image();
	imgs[3]=new Image();
	imgs[4]=new Image();
	imgs[5]=new Image();
	
	imgs[0].src="images/main/1.jpg";
	imgs[1].src="images/main/2.jpg";
	imgs[2].src="images/main/3.jpg";
	imgs[3].src="images/main/4.jpg";
	imgs[4].src="images/main/5.jpg";
	imgs[5].src="images/main/6.jpg";
	
function initGallery(){ 
	var interval=setInterval("playGallery()",4000); 
}
function playGallery(){
	blendImages("imageHolder","holderImage",imgs[currImg],imgs[nextImg],1000);
	currImg++;
	nextImg++;
	if(currImg==5)
	{
		//alert("currIMG"+currImg);
		nextImg=0;
	}
	if(nextImg==1)
	{
		//alert("1");
		currImg=0;
	}
	
}
addEvent(window,"load",initGallery,false);