function signin(nom,email,message)
{
	var OAjax;
	if (window.XMLHttpRequest) OAjax = new XMLHttpRequest();
	else if (window.ActiveXObject) OAjax = new ActiveXObject('Microsoft.XMLHTTP'); 
	OAjax.open('POST',"script/signin.php",true);
	OAjax.onreadystatechange = function()
	{
		if (OAjax.readyState == 4 && OAjax.status==200)
		{
			if (document.getElementById) 
			{	
				if (OAjax.responseText =='true') {
				closeForm();
				document.getElementById('messageSent').innerHTML='Message sent';		
				}else{
				document.getElementById('messageSent').innerHTML=OAjax.responseText;
				}
			}
		}
	}
	OAjax.setRequestHeader('Content-type','application/x-www-form-urlencoded');
	OAjax.send('nom='+nom+'&email='+email+'&message='+message);
}