function apparait_disparait_opacite (indice) {
	var obj = document.getElementById(apparait_disparait_opacite_obj);
	obj.style.opacity = indice;
	var ie = indice * 100;
	obj.style.filter = 'Alpha(opacity='+ie+')'; //IE
	if (apparait_disparait_opacite_sens == 'moins') indice -= 0.02;
	else indice += 0.02;
	
	if (indice < 0) apparait_disparait_opacite_sens = 'plus';
	if (indice >= 1) apparait_disparait_opacite_sens = 'moins';
	
	setTimeout('apparait_disparait_opacite('+indice+')', 100);
}

function clignote_message () {
	var obj = document.getElementById(id);
	if (obj.style.visibility == 'visible') {
		obj.style.visibility = 'hidden';
	} else {
		obj.style.visibility = 'visible';
	}
}


function effet_gif (num, max, vitesse) {
	for (i=1; i<=max; i++) {
		if (num != i) document.getElementById('gif'+i).className = 'hidden';
	}
	document.getElementById('gif'+num).className = 'inline';
	var nouveau = num + 1;
	if (nouveau > max) nouveau = 1;
	setTimeout("effet_gif("+nouveau+", "+ max +", "+ vitesse+")", vitesse);
}



var effet_marquee_widthplus = 500;
var effet_marquee_widthmoins = 0-effet_marquee_widthplus;
var effet_marquee_var = 0;
var effet_marquee_var2 = effet_marquee_widthmoins;

function effet_marquee () {
	document.getElementById('marquee1').style.right = effet_marquee_var+'px';
	effet_marquee_var += 1;
	if (effet_marquee_var >= effet_marquee_widthplus) effet_marquee_var = effet_marquee_widthmoins;
	
	document.getElementById('marquee2').style.right = effet_marquee_var2+'px';
	effet_marquee_var2 += 1;
	if (effet_marquee_var2 >= effet_marquee_widthplus) effet_marquee_var2 = effet_marquee_widthmoins;
}


function menu_deroulant (num, max) {
	if (num == 0) {
		for (i=1; i<=max; i++) {
			document.getElementById('sousmenu'+i).className = 'hidden';
		}
	} else {
		for (i=1; i<=max; i++) {
			if (i != num) document.getElementById('sousmenu'+i).className = 'hidden';
		}
		document.getElementById('sousmenu'+num).className = 'block';
	}
}



var opacite_array = new Array;
var opacite_nbr = 6;
for (i=1; i<=opacite_nbr; i++) {
	opacite_array[i] = 0;
}
opacite_array[1] = 0.5;
var sens = 0;
var img = 1;
var ie;
function opacite () {
	var image = 'img'+img;
	var i;
	var y;
	for (i=1; i<=opacite_nbr; i++) {
		if (i == img) opacite_array[i] = opacite_array[i] + 0.01;
		else opacite_array[i] = opacite_array[i] - 0.01;
		if (opacite_array[i] > 1) {
			img++;
			for (y=1; y<=opacite_nbr; y++) {
				if (y != i) opacite_array[y] = 0;
			}
			if (img > opacite_nbr) img = 1;
		}
	}
	
	
	for (i=1; i<=opacite_nbr; i++) {
		document.getElementById('img'+i).style.opacity = opacite_array[i];
		ie = opacite_array[i] * 100;
		document.getElementById('img'+i).style.filter = 'Alpha(opacity='+ie+')';
	}
}


function test_entier (id) {
	var entier = parseInt(document.getElementById('form'+id).nombre.value);
	if (!isNaN(entier)) document.getElementById('form'+id).submit();
	else alert('Veuillez entrer un nombre valide');
}

function volet_visible (num) {
	for (i=1; i<=7; i++) {
		if (i != num) document.getElementById('piscine'+i).className = 'hidden';
	}
	document.getElementById('piscine'+num).className = 'block';
}