// Calcul jantes
function calcul_jante(prix,prixm){
	value = document.form_qte.qte_jante.value;
	document.getElementById('calcul_jante').innerHTML = Math.round((value*prix)*100)/100;
	change = file('/inc/lib/changeSession.lib.php?champ=qte_jante&nb=' + value);
	if (document.getElementById('calcul_montage')){ 
		calcul_montage(prixm);
	}
}

// Calcul pneu
function calcul_pneu(prix,prixm) {
	value = document.form_qte.qte_pneu.value;
	document.getElementById('calcul_pneu').innerHTML = Math.round((value*prix)*100)/100;
	change = file('/inc/lib/changeSession.lib.php?champ=qte_pneu&nb=' + value);
	if (document.getElementById('calcul_montage')){ 
		calcul_montage(prixm);
	}
}

// Calcul montage
function calcul_montage(prix) {
	valueM = Math.min(document.form_qte.qte_pneu.value,document.form_qte.qte_jante.value);
	document.getElementById('calcul_montage').innerHTML = Math.round((valueM*prix)*100)/100;
}

// Calcul chaine
function calcul_chaine(prix) {
	value = document.form_qte.qte_chaine.value;
	document.getElementById('calcul_chaine').innerHTML = Math.round((value*prix)*100)/100;
	change = file('/inc/lib/changeSession.lib.php?champ=qte_chaine&nb=' + value);
}

// Calcul total
function calcul_total(prixJ,prixP,prixM,prixC) {		 
	total=0;
	
	if(typeof(document.form_qte.qte_jante) == 'undefined' || document.form_qte.qte_jante == 0){
		document.form_qte.qte_jante = 0;
	}else{
		valueJ = document.form_qte.qte_jante.value
		total = total+Math.round((valueJ*prixJ)*100)/100;
	}
	
	if(typeof(document.form_qte.qte_pneu) == 'undefined' || document.form_qte.qte_pneu == 0){
		document.form_qte.qte_pneu = 0;
	}else{
		valueP = document.form_qte.qte_pneu.value;
		total = total+Math.round((valueP*prixP)*100)/100;
	}
	
	if(document.form_qte.qte_pneu != 0 && document.form_qte.qte_jante != 0){
		valueM2 = Math.min(document.form_qte.qte_pneu.value,document.form_qte.qte_jante.value);
		total = total+Math.round((valueM2*prixM)*100)/100;
	}
	
	if(typeof(document.form_qte.qte_chaine) == 'undefined' || document.form_qte.qte_chaine == 0){
		document.form_qte.qte_chaine = 0;
	}else{
		valueC = document.form_qte.qte_chaine.value;
		total = total+Math.round((valueC*prixC)*100)/100;
	}	
	document.getElementById('calcul_total').innerHTML = Math.round(total*100)/100;
}

function file(fichier){
	if(window.XMLHttpRequest) // FIREFOX
		xhr_object = new XMLHttpRequest(); 
	else if(window.ActiveXObject) // IE
		xhr_object = new ActiveXObject("Microsoft.XMLHTTP"); 
	else
		return(false);
	xhr_object.open("GET", fichier, false); 
	xhr_object.send(null); 
	if(xhr_object.readyState == 4)
		return(xhr_object.responseText);
	else
		return(false);
}