function checkSubmit()
{
	var regExp = new RegExp("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)+$");

	if(document.formSend.nome.value=='' 
      || document.formSend.cognome.value==''
      || document.formSend.azienda.value==''
      || !regExp.test(document.formSend.email.value)
      || document.formSend.www.value==''
      ){
        alert("Compilare correttamente la form");
   		return false;
   	}
   	else{
   	    return true;
   	}
}