// Source depuis http://www.brainerror.net/scripts/javascript/blendtrans
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);
	}
}

function blendimage(divid, imageid, imagefile, millisec) {
	var speed = Math.round(millisec / 100);
	var timer = 0;

	//set the current image as background
	document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";

	//make image transparent
	changeOpac(0, imageid);

	//fade out image

	//make new image
	document.getElementById(imageid).src = imagefile;

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

function blendimage2(imageid, imagefile, millisec) {
	var speed = Math.round(millisec / 100);
	var timer = 0;

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

	//make new image
	document.getElementById(imageid).src = imagefile;

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

var Opacite = 0 ;
function changerOpacite(Objet1, Objet2, Duree, ImageSuivante)
{
	if (Opacite == 0)
		changeOpac(0, Objet2);

	changeOpac(100-Opacite, Objet1) ;
	changeOpac(Opacite, Objet2) ;

	Opacite++ ;
	if (Opacite <= 100)
		setTimeout("changerOpacite('" + Objet1 + "','" + Objet2 + "'," + Duree + ",'" + ImageSuivante + "')", Duree) ;
	else
	{
		Opacite = 0 ;
		document.getElementById(Objet1).style.zIndex = 1 ;
		document.getElementById(Objet2).style.zIndex = 2 ;
		document.getElementById(Objet1).src = ImageSuivante ;
	}
}

function currentOpac(id, opacEnd, millisec) {
	//standard opacity is 100
	var currentOpac = 100;

	//if the element has an opacity set, get it
	if(document.getElementById(id).style.opacity < 100) {
		currentOpac = document.getElementById(id).style.opacity * 100;
	}

	//call for the function that changes the opacity
	opacity(id, currentOpac, opacEnd, millisec)
}