function validate()
			{
				
				var number = document.getElementById("hostnumber").value;
				
				//test si le champs firstname est vide
				if(document.getElementById("firstname").value == "")
				{document.getElementById("firstname").style.background = "red";}
				break;
				//test si le champs lastname est vide
				if(document.getElementById("lastname").value == "")
				{document.getElementById("lastname").style.background = "red";}
				break;
				
				//test des adresses mails
				
					
				
				//test le host number
				if ((number.length <9) || (isNaN(document.getElementById("hostnumber").value)))
				{document.getElementById("hostnumber").style.background = "red";}
				break;
					
			}
		
		function VerifMail()
			{
				var reg = new RegExp('^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$', 'i');

				if(reg.test(document.getElementById("email").value))
				{return(true);}	else {return(false);}
				break;
			}