function checkEmail() {

    if(document.reception.subject.value =="") {  
        alert("Please enter a subject");
        document.reception.subject.focus();
        return false;
    }
    if ((document.reception.email.value.indexOf('@') == -1) || (document.reception.email.value.indexOf('.') == -1)) {

         alert("You must enter a valid return email address.");

   	  document.reception.email.focus();

   	  return false;

    }
    if(document.reception.message.value =="") {  
        alert("Please enter a message");
        document.reception.message.focus();        
        return false;
    }
    return true;
}