function writediv(texte,refbox) {
	document.getElementById(refbox).innerHTML = texte;
}

function verifref(email,refbox){
if(email != ''){
	 if(texte = file('sql_checkref.php?email='+escape(email))) {
		if(texte == 1)
			writediv('<span style="color:#000000"><b>'+email+' :</b> cet email est deja existant dans notre base de données</span>',refbox);	
		else
			writediv('',refbox);
	   }
	}
}

function file(fichier) {
 if(window.XMLHttpRequest) // FIREFOX
	  xhr_object = new XMLHttpRequest();
 else if(window.ActiveXObject) // IE
	  xhr_object = new ActiveXObject("Microsoft.XMLHTTP");
 else
	  return(false);
 xhr_object.open("GET", fichier, false);
 xhr_object.send(null);
 if(xhr_object.readyState == 4) return(xhr_object.responseText);
 else return(false);
}