function setImageBg(ville,winSize){

// get window's size
var myWidth = 1008, myHeight = 666;
if( typeof( window.innerWidth ) == 'number' ) {
	//Non-IE
	myWidth = window.innerWidth;
	myHeight = window.innerHeight;
	} else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
	//IE 6+ in 'standards compliant mode'
	myWidth = document.documentElement.clientWidth;
	myHeight = document.documentElement.clientHeight;
	} else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
	//IE 4 compatible
	myWidth = document.body.clientWidth;
	myHeight = document.body.clientHeight;
}


// define image format
if(myWidth > winSize) {
	
	// locate bg image
	if (ville == "")
		var urlImageBg = "../images/design/bg/photo-background-1600.jpg";
	else
		var urlImageBg = "../images/design/bg/"+ville+"/photo-background-1600.jpg";
	
	// if url contains "30projets" load appropriate bg image			
	var url=window.location + "";
	var reg=new RegExp("(30projets)","gi");
	if (url.match(reg))
	 	var urlImageBg = "../images/design/bg/fond-30ans-1600.jpg";		
	 
	 // set background
	document.getElementById("Contener").style.backgroundImage = "url('"+urlImageBg+"')";
}
//exception bg video
if(typeof(CONST_VIDEO_BG)!='undefined')
	document.getElementById("Contener").style.background = "none";

}