function actu_iframe(){

if(navigator.appName=="Microsoft Internet Explorer" ){
if(document.all) document.all.id_iframe.style.height = document.frames("id_iframe" ).document.body.scrollHeight;
else document.getElementById("id_iframe" ).style.height = document.getElementById("id_iframe" ).contentDocument.body.scrollHeight;
}
else{

document.getElementById("id_iframe" ).style.height = document.getElementById("id_iframe" ).contentDocument.body.offsetHeight+"px";

}

}