//________________________________________________preload()  default images sur body

function preload(){
//alert("init preload...");

	tabImgOff=new Array(
	"logoThemaOff_01.jpg",
	"logoThemaOff_02.jpg",
	"logoThemaOff_03.jpg",
	"logoThemaOff_04.jpg",
	"em1.gif");

	tabImgOn=new Array(
	"logoThemaOn_01.jpg",
	"logoThemaOn_02.jpg",
	"logoThemaOn_03.jpg",
	"logoThemaOn_04.jpg",
	"em2.gif");

	//______________traitement chaînes pour variation src uniquement sur On Off
	imgPath = "/images/";
	imgString = tabImgOff[0];
	indexOff = imgString.indexOf("Off");
	imgStringStart = imgString.substring(0,imgString.indexOf("Off"));
	imgStringStop = imgString.substring(imgString.indexOf("_"),imgString.length);
	imgStringOn = "On";
	imgStringOff = "Off";
	imgStringOn = imgPath+imgStringStart+"Off"+imgStringStop;

	//______________init tableau objets images
	tabImgLoad=new Array();
	for(i=0;i<tabImgOff.length;i++){
		tabImgLoad[i]=new Image();
		tabImgLoad[i].src=tabImgOff[i];
	//alert(tabImgLoad[i]);
	}//fin for

//return (tabImgLoad);
}

//________________________________________________ imgOver()  

function imgOver(img){

	tabImgOn=new Array(
	"logoThemaOn_01.jpg",
	"logoThemaOn_02.jpg",
	"logoThemaOn_03.jpg",
	"logoThemaOn_04.jpg",
	"em1.gif");
	
	//num sert de référent à l'index du tableau d'images
	num = parseInt(img.name.substring(3,img.name.length));
	img.src = "images/"+tabImgOn[num];

}//fin imgOver()

//________________________________________________ imgOff()  

function imgOff(img){

	tabImgOff=new Array(
	"logoThemaOff_01.jpg",
	"logoThemaOff_02.jpg",
	"logoThemaOff_03.jpg",
	"logoThemaOff_04.jpg",
	"em2.gif");
	
	//num sert de référent à l'index du tableau d'images
	num = parseInt(img.name.substring(3,img.name.length));
	img.src = "images/"+tabImgOff[num];

}//fin imgOver()