function addLoadEvent(func) {
	var after=(arguments.length > 1) ? arguments[1] : false;
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			if (!after) func();
			oldonload();
			if (after) func();
		}
	}
}


function changeType () {
	if (elt = document.getElementById('type_transaction')) {
		if ((tLoc = document.getElementById('zonePrixLoc')) && (tVente = document.getElementById('zonePrixVente'))) {
			if (elt.value=="Vente") {
				tLoc.style.display="none";
				tVente.style.display="block";
			}
			else {
				tLoc.style.display="block";
				tVente.style.display="none";
			}
		}
	}
}