// JavaScript Document
function show_pourquoi(a){ 
	for(i=1; i<6; i++) {
		document.getElementById("bloc_pquoi_" + i).style.display = "none";
		document.getElementById("bt_pquoi_" + i).className = "pquoi_off";
	}
	document.getElementById("bloc_pquoi_" + a).style.display = "block";
	document.getElementById("bt_pquoi_" + a).className = "pquoi_on";
}