// JScript 文件
var browserName = navigator.appName;
var agt=navigator.platform.toLowerCase();
var ie5 = (browserName == "Microsoft Internet Explorer") && navigator.appVersion.indexOf('MSIE 5')>0;
var ie6 = (browserName == "Microsoft Internet Explorer") && navigator.appVersion.indexOf('MSIE 6')>0;
var ns6 = (navigator.vendor == "Netscape6");
navigator.userAgent.indexOf("Netscape/7")>=0 ? ns7=true:ns7=false;
var mac  = (agt.indexOf('mac') != -1);
var images_num = 12;
var delay = 3000;
var suffix = ".jpg";
var image_root = "commendationPic/";
var bottomImageName = "bottom";
var userAgent = window.navigator.userAgent;
var browserVersion = parseInt(userAgent.charAt(userAgent.indexOf("/")+1),10);

var arImage = new Array();
var arTitle = new Array();
var arUrl = new Array();
var curImage = 1;
var imgObj;
var titleObj;
var urlObj;

function setTitleObj(objID)
{
    titleObj = document.getElementById(objID);
}

function setUrlObj(objID)
{
    urlObj = document.getElementById(objID);
}

function setImageArray(ar)
{
	if (null != ar)
		arImage = ar;
}

function setTitleArray(ar)
{
    if (null != ar)
        arTitle = ar;
}

function setUrlArray(ar)
{
    if (null != ar)
        arUrl = ar;
}

//test la version du browser et la platform afin d'activer ou non les transitions
function enableEffect(){
	if(!mac && ie5 || ie6 || ns7){
		return true;
	}
	else{
		return false;			
	}
}

//return true si le browser est une des versions d'ie
function isExplorer(){
	return userAgent.indexOf("MSIE") > 0;
}

function getElement(name,layer){
	if (browserVersion < 4) return document[name];
	var curDoc = layer ? layer.document : document;
	var elem = curDoc[name];
	if (!elem)
	{
		for (var i=0;i<curDoc.layers.length;i++)
		{
			elem = getElement(name,curDoc.layers[i]);
			if (elem) return elem;
		}
	}
	return elem;
}

function getImage(name){
	return (!isExplorer()) ? getElement(name,0) : document[name];
}

//Instanci?par notifyLoad et declenche soit l'action de swap image soit le fadeOut
function loadImage(){
	if(enableEffect()){
		action = setInterval('fadeOut()',1);
	}
	else{
		which = Math.floor(Math.random()*images_num);
		showImage();
				
	}						
}

//Instanci?par l'evenement onLoad de l'image name="bottom"
function notifyLoad(source){
    imgObj = source;
	if (0 == arImage.length)
	{
	    setTimeout("loadImage()",1000);
		return;
	}
		
	if(enableEffect()){
		action = setInterval('fadeIn()',1);			
	}
	else if(ns6){			
		setInterval("loadImage()",4000);
	}
	else{
		setTimeout("loadImage()",delay);			
	}
}

count = 100;
//FadeOut avant le notifyLoad de l'image
function fadeOut(){
	if(count > 10){
		count=count-10;
		//document.getElementById('bottomImageName').style.filter = 'Alpha(opacity='+count+')';
		imgObj.style.filter = 'Alpha(opacity='+count+')';
	}
	else if(count == 10){
		clearInterval(action);
		//which = Math.floor(Math.random()*images_num);
		//var bottomImage = getImage(bottomImageName);
		//bottomImage.src = image_root+which+suffix;
		showImage();			
	}
}

//FadeIn avant le loadImage de l'image
function fadeIn(){
	if(count < 100){
		count=count+10;
		//document.getElementById('bottomImageName').style.filter = 'Alpha(opacity='+count+')';
		imgObj.style.filter = 'Alpha(opacity='+count+')';
	}
	else if(count == 100){
		clearInterval(action);			
		setTimeout("loadImage()",delay);
	}
}

function showImage()
{
	if (null != arImage[curImage])
		imgObj.src = image_root + arImage[curImage];
	
	if (null != arTitle[curImage])
	    titleObj.innerText = arTitle[curImage];
	    
	if (null != arUrl[curImage])
	    urlObj.href = arUrl[curImage];
	
	if (curImage < arImage.length-1)
		curImage++;
	else
		curImage = 0;
}