function visibilite(thingId)
{
var targetElement;
targetElement = document.getElementById(thingId) ;
if (targetElement.style.display == "none")
{
targetElement.style.display = "" ;
} else {
targetElement.style.display = "none" ;
}
}

function send_req_php_login(f)
{
	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; 
		 } 

	var pwd = document.getElementById(f).value;
	var data = "pwd="+pwd;	 
	
	xhr_object.open("POST", 'pwd.php', true); 
	 
	xhr_object.onreadystatechange = function ()	{
		if(xhr_object.readyState == 4)
			{
	         var reponse = xhr_object.responseText.split(":"); 
			 var CMD_r = reponse[1]; 
			 if(CMD_r == "KO")
				{
				visibilite('password');
				document.getElementById("pwd2").value="";
				}
			 else if(CMD_r =="OK")
				{	
				visibilite('write_news');
				document.getElementById(f).value="";
				document.getElementById("pwd2").value=pwd;
				visibilite('password');
				}
			} 
	} 

	xhr_object.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); 
	xhr_object.send(data); 

}