function switch_categ(elem){
	var i=1;
	var ul;
	while(ul = document.getElementById("cat_"+i)){
		ul.style.display = "none";
		i++;
	}
	var ul = document.getElementById(elem);
	if(ul.style.display == "none"){
		ul.style.display = "";
	} else {
		ul.style.display = "none";
	}
}

function popupcentree(page,largeur,hauteur,options) {
	var top=(screen.height-hauteur)/2;
	var left=(screen.width-largeur)/2;
	window.open(page,"","top="+top+",left="+left+",width="+largeur+",height="+hauteur+","+options);
}