function checkEmail(email)  { 
	                        
        if (email.search(/^[_a-z0-9-]+(.[_a-z0-9-]+)*[^._-]@[a-z0-9-]+(.[a-z0-9]{2,4})*$/) == -1) { 
            alert ('Vous devez entrer une adresse Email valide'); 
            return false; 
        	}
		else
		return true
		}
		

	function checkrequired(which) {
	
		var email = which.email.value ;
		
		var pass=true
		if (document.images){
			for (i=0;i<which.length;i++){
				var tempobj=which.elements[i]
				if (tempobj.id.substring(0,8)=="required"){
					if (((tempobj.type=="text"||tempobj.type=="textarea")&&tempobj.value=='')||(tempobj.type.toString().charAt(0)=="s"&&tempobj.selectedIndex==-1)){
					pass=false
					break
					}
				}
			}
		}
		if (!pass){
		alert("Tous les champs obligatoires doivent etre renseign\351s")
		return false
		}
	else {
	
	return checkEmail(email);
	
	}
	}