function precharge() { 
  for (i = 0; i < tbimage.length; i++) { 
    preImages[i] = new Image()
    preImages[i].src = '_img/intro/'+tbimage[i]+'.jpg'
}
setTimeout(imageAleat);
}


function imageAleat()
{
var image = new Array();

image.push('_img/intro/cheminee-magnan-tancarville.jpg');
image.push('_img/intro/cheminee-magnan-fecamp.jpg');
image.push('_img/intro/cheminee-magnan-rivabella.jpg');
image.push('_img/intro/cheminee-magnan-rotissiere.jpg');
image.push('_img/intro/cheminee-magnan-larochelle.jpg');
image.push('_img/intro/cheminee-magnan-style.jpg');
image.push('_img/intro/cheminee-magnan-maupassant.jpg');


var liens = new Array();

liens.push('cheminee-tancarville.php');
liens.push('cheminee-fecamp.php');
liens.push('cheminee-rivabella.php');
liens.push('cheminee-rotissiere.php');
liens.push('cheminee-larochelle.php');
liens.push('cheminee-style-magnan.php');
liens.push('cheminee-maupassant.php');
var n= 0;
n=Math.floor(Math.random()*image.length);
document.getElementById('mapub').src= image[n];
document.getElementById('monlien').href= liens[n];

setTimeout("imageAleat()",2000);
}