function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}


function changeImagesArray(array) {
	if (preloadFlag == true) {
		var d = document; var img;
		for (var i=0; i<array.length; i+=2) {
			img = null; var n = array[i];
			if (d.images) {img = d.images[n];}
			if (!img && d.getElementById) {img = d.getElementById(n);}
			if (img) {img.src = array[i+1];}
		}
	}
}


function changeImages() {
	changeImagesArray(changeImages.arguments);
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		pre_index_05_over = newImage('img/index_05-over.jpg');
		pre_index_08_over = newImage('img/index_08-over.jpg');
		pre_index_09_over = newImage('img/index_09-over.jpg');
		pre_index_13_over = newImage('img/index_13-over.jpg');
		pre_index_14_over = newImage('img/index_14-over.jpg');
		pre_index_15_over = newImage('img/index_15-over.jpg');
		pre_index_16_over = newImage('img/index_16-over.jpg');
		pre_index_17_over = newImage('img/index_17-over.jpg');
		pre_index_18_over = newImage('img/index_18-over.jpg');
		pre_index_19_over = newImage('img/index_19-over.jpg');
		preloadFlag = true;
	}
}

function verifier_formulaire_contact(form) {
	if (form.nom.value.length == 0) {
		alert('Veuillez compléter votre nom');
		form.nom.focus();
		return false;
	} else if (form.email.value.length == 0 || !is_email(form.email.value)) {
		alert('Veuillez compléter/corriger votre adresse email');
		form.email.focus();
		return false;
	} else if (form.message.value.length == 0) {
		alert('Veuillez compléter votre message');
		form.message.focus();
		return false;
	} else if (form.captcha.value.length != 3) {
		alert('Veuillez compléter le code de sécurité');
		form.captcha.focus();
		return false;
	}
	form.envoi.value = 1;
	return true;
}

function is_email(email) {
	var filter = RegExp("^([a-zA-Z0-9_-])+([.]?[a-zA-Z0-9_-]{1,})*@([a-zA-Z0-9-_]{2,}[.])+[a-zA-Z]{2,3}$");
	return filter.test(email);
}