function xmlhttpGet(strURL) {
    var xmlHttpReq = false;
    var self = this;
    // Mozilla/Safari
    if (window.XMLHttpRequest) {
        self.xmlHttpReq = new XMLHttpRequest();
    }
    // IE
    else if (window.ActiveXObject) {
        self.xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
    }
    self.xmlHttpReq.open('GET', strURL, true);

    self.xmlHttpReq.onreadystatechange = function() {
        if (self.xmlHttpReq.readyState == 4) {
            updatepage(self.xmlHttpReq.responseText);
        }
    }
    self.xmlHttpReq.send(null);
}



function updatepage(str){

    document.images["image"].src = 'img_petit/petit'+str;
}
function updatepage2(str){

    document.images["image"].src = 'images/miniatures/'+str;
}
function updatepage3(){

    document.images["image"].src = 'img_petit/petitrien.gif';
}
yyy='';
function scrm(){
   yyy =document.documentElement.scrollTop;

 }
  window.onload=scrm;
  window.onscroll=scrm;


function onclick_page(event){
  var xx = event.clientX- document.getElementById("droite").offsetLeft-210;
  var yy = event.clientY-290;


  var el=document.getElementById("image_position");
el.style.right=-xx+"px";
el.style.top=yy+yyy+"px";
el.style.posRight=-xx;
el.style.postop=yy+yyy;
}