function valida_envia(){ 
    //valido el nombre 
    if (document.formulari.nom.value.length<4){ 
       alert("You should write your name") 
       document.formulari.nom.focus() 
       return 0; 
    } 
	
	//valido la empresa
	 if (document.formulari.organitzacio.value.length<4){ 
       alert("You should fill in your organization('none' if not working)") 
       document.formulari.organitzacio.focus() 
       return 0; 
    } 
	
	
	var hayAlgo = true;
    //hay algo en el MAIL?
    if(document.formulari.email.value==""){
        hayAlgo = false;
        alert("Your email field is not written.");
        document.formulari.email.focus();
        return false;
    }
    // validar la cuenta de correo usando una expresión regular (RegExp)
    if(document.formulari.email.value.search(/^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/ig)){
        hayAlgo = false;
        alert("Your email is not valid, you must fill in it in the right way: name@server.domain");
        document.formulari.email.select();
        document.formulari.email.focus();
        return false;
    }
	document.formulari.submit(); 
}