function displayDiv(obj){
	var el = document.getElementById(obj);
	if(el.style.display != "block"){
		el.style.display = "block";
		document.getElementById("optionmore").style.background = "url(/multimedia/images/img_structures/ico_moins.gif) right no-repeat";
	}
	else{
		el.style.display = "none";
		document.getElementById("optionmore").style.background = "url(/multimedia/images/img_structures/ico_plus.gif) right no-repeat";
	}
}