function check()
	{
		
		var test=true;
		var message='';
		
		
		if (isEmpty(document.form_ns_contact.email_du_contact.value))
		{
			message+='\nYou forgot your Email !';
			test=false;
		} else if (isNotEmailAdress(document.form_ns_contact.email_du_contact.value))
		{
			message+='\nYour email seems to be not a valid email, please check it again !';
			test=false;
		}
		if (isEmpty(document.form_ns_contact.nom_du_contact.value))// && isNotIpAdress(document.form2.nom.value))
		{
			message+='\nYou forgot your Name !';
			test=false;
		}
		if (isEmpty(document.form_ns_contact.msg_contact.value))// && isNotAlphabetic(document.form.msg.value))
		{
			message+='\nYou forgot the Message !';
			test=false;
		}
		
		
//verifie si on a bien selectionne une categorie dans la liste deroulante

		if (document.form_ns_contact.choix_contact.value == 0)
		{
		message+='\nPlease choose a Subject !';
		test=false;
		}
	
		
			
		
		if (message!='') alert(message);
		return test; 
	}