function changeMenu(id) {
  var img = document.getElementById(id);
  if(img.src.match(/rollover/i)) {
    img.src = './imgs/'+id+'.gif';
  } else {
    img.src = './imgs/'+id+'_rollover.gif';
  }
}
function changeOffre(id) {
  var img = document.getElementById(id);
  var txt = document.getElementById('txt'+id)
  if(img.src.match(/rollover/i)) {
    img.src = './imgs/'+id+'.gif';
    txt.style.color='#e1c476';
  } else {
    img.src = './imgs/'+id+'_rollover.gif';
    txt.style.color='#595959';
  }
}
function showImg(id) {
  document.getElementById('showMedium').innerHTML='<span></span>';
  var img = document.getElementById(id);
  var url_mini = img.src;
  var url_medium = url_mini.replace(/mini/,'medium');
  var newIm = document.createElement('img');
  newIm.src = url_medium;
  newIm.title = document.imgsTitles.elements[id].value;
  newIm.style.width = '450px';

  var old = document.getElementById('showMedium').firstChild;
  document.getElementById('showMedium').replaceChild(newIm, old);
}
function interested() {
  document.getElementById('div_insterested').style.display = 'block';
}