function changeQte(chpId, val) {
	var chp = document.getElementById('qte'+chpId);
	if (val > 0 || chp.value > 1) {
		chp.value = chp.value * 1 + val;
	}
}

function ajouterPanier(ref, qte) {
	if (qte > 0) {
		dims_xmlhttprequest_tofunction('index-light.php', 'op=panier_ajout&ref=' + ref + '&qte=' + qte, showmsg);
	} else {
		alert ("La quantit\351 que vous avez saisi pour l'article " + ref + "\nne doit pas \352tre n\351gative ou nulle.");
	}
}

function position_msgbox() {
	var posX = (screen.availWidth - 300) / 2;
	var posY = (screen.availHeight - 125) / 2;

	//if the user is using IE 4+
	if (document.all) {
		popup.style.left = posX;
		popup.style.top = document.body.scrollTop + posY;
	}
	//if the user is using NS6+
	else if (document.getElementById) {
		document.getElementById("popup").style.left = posX+'px';
		document.getElementById("popup").style.top = pageYOffset + posY+'px';
	}
	//else if the user is using NS 4
	else if (document.layers) {
		document.popup.left = posX;
		document.popup.top = dsoctop + posY;
	}
}

function showmsg(msg) {
	position_msgbox();
	document.getElementById('popup').innerHTML = msg;
	document.getElementById('popup').style.visibility = 'visible';
	setTimeout("hidemsg()", 1000);
}

function hidemsg() {
	document.getElementById('popup').style.visibility = 'hidden';
	document.getElementById('popup').innerHTML = '';
}