var xhr=null;

function getXhr()
 {
  if(window.XMLHttpRequest) xhr = new XMLHttpRequest();
  else if(window.ActiveXObject)
   {
    try
     {
      xhr = new ActiveXObject("Msxml2.XMLHTTP");
     }
    catch (e)
     {
      xhr = new ActiveXObject("Microsoft.XMLHTTP");
     }
   }
  else
   {
    alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest, veuillez le mettre _  jour");
    xhr = false;
   }
 }

/**
 *
 * @access public
 * @return void
 **/
function load(num){
	getXhr();
  xhr.onreadystatechange = function(){
    if(xhr.readyState == 4 &&  xhr.status== 200){
      document.getElementById('photo').innerHTML=xhr.responseText;
     }
  }
  xhr.open("POST",'ajaxload.php',true);
  xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
  xhr.send("num="+num);
}
function suivant(num){
  suivan=document.getElementById('suiv').value;
  getXhr();
  xhr.onreadystatechange = function(){
    if(xhr.readyState == 4 &&  xhr.status== 200){
      document.getElementById('photo').innerHTML=xhr.responseText;
     }
  }
  xhr.open("POST",'ajaxsuivant.php',true);
  xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
  xhr.send("num="+num+"&suivant="+suivan);
}
function precedent(num){
  prece=document.getElementById('prec').value;
  getXhr();
  xhr.onreadystatechange = function(){
    if(xhr.readyState == 4 &&  xhr.status== 200){
      document.getElementById('photo').innerHTML=xhr.responseText;
     }
  }
  xhr.open("POST",'ajaxprecedent.php',true);
  xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
  xhr.send("num="+num+"&precedent="+prece);
}