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..."); 
				   xhr = false; 
				} 
			}
			function affiche_details(num){
				getXhr();
				xhr.onreadystatechange = function(){
					if(xhr.readyState == 4 && xhr.status == 200){
						leselect = xhr.responseText;
						document.getElementById('document_details').innerHTML = leselect;						
					}
				}
				xhr.open("POST","./infos_document.php",true);
				xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
				xhr.send("num_document="+num);
			}