function helper_login(id_div,id_form,id_field)
{
	var form=document.forms[id_form];
	var field=form.elements[id_field];

	var xhr_object = null; 
	     
	if(window.XMLHttpRequest) // Firefox 
		xhr_object = new XMLHttpRequest(); 
	else if(window.ActiveXObject) // Internet Explorer 
		xhr_object = new ActiveXObject("Microsoft.XMLHTTP"); 
	else { // XMLHttpRequest non supporté par le navigateur 
	      alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest..."); 
	      return; 
	} 
	 
	xhr_object.open("POST", "helpers.php", true); 
	     
	xhr_object.onreadystatechange = function() { 
		if(xhr_object.readyState == 4) {
			eval(xhr_object.responseText);
		}
	} 
	 
	xhr_object.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); 
	var data = "value="+escape(field.value)+"&form="+escape(id_form)+"&field="+escape(id_field)+"&div="+escape(id_div)+"&type="+escape("login");
	if(data) {
	  xhr_object.send(data); 
	} else {
	  hide_helper(id_div);
	}
}

function set_helper_field(id_div,id_form,id_field,value)
{
	var form=document.forms[id_form];
	var field=form.elements[id_field];
	field.value=value;
	hide_helper(id_div);
	field.focus();
}

function hide_helper(id_div)
{
	var div=document.getElementById(id_div);
	div.style.display="none";
}