function fadeIn(id, opacStart, opacEnd, millisec) {
 toggle(id);
 var speed = Math.round(millisec / 100);
 var timer = 0;
 for(i = opacStart; i <= opacEnd; i++) {
  setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
  timer++;
 }
}

function fadeOutandShow(id, idReplace, idControl, opacStart, opacEnd, millisec) {
 var speed = Math.round(millisec / 100);
 var timer = 0;
 if(opacStart > opacEnd) {
  for(i = opacStart; i >= opacEnd; i--) {
   setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
   timer++;
  }
 } else if(opacStart < opacEnd) {
  for(i = opacStart; i <= opacEnd; i++) {
   setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
   timer++;
  }
 }
 setTimeout("document.getElementById('"+id+"').style.display = 'none'",(timer*speed));
 setTimeout("document.getElementById('"+idControl+"').style.display = 'none'",(timer*speed));
 setTimeout("document.getElementById('"+idReplace+"').style.display = ''",(timer*speed));
}

function changeOpac(opacity, id) {
 var object = document.getElementById(id).style;
 object.opacity = (opacity / 100);
 object.MozOpacity = (opacity / 100);
 object.KhtmlOpacity = (opacity / 100);
 object.filter = "alpha(opacity=" + opacity + ")";
} 

function toggle(idElement) {
 document.getElementById(idElement).style.display =  (document.getElementById(idElement).style.display != 'none' ? 'none' : '' );
}

function turnOff(idElement) {
 document.getElementById(idElement).style.display =  'none';}

function goTo() {
 document.location.href = 'http://www.paris2amsterdam.com';}