function ouvrirpop(url,nom,haut,gauche,largeur,hauteur,options) {
ouvpop=window.open(url,nom,"top="+haut+",left="+gauche+",width="+largeur+",height="+hauteur+","+options); }

var image_originale = false;
function switchImage(src){
	image_to_change = document.getElementById('image_to_change');
	if(src){
		if(!image_originale){
			image_originale = image_to_change.src;
		}
		image_to_change.src = src;
	}
	else{
		image_to_change.src = image_originale;
	}
}