Element.update("label_subject", "<em class='flash-error'>Pleae enter a valid subject.<\/em>");
Element.update("label_email", "<em class='flash-error'>Please enter an email address.<\/em>");
Element.update("label_email", "<em class='flash-error'>Please enter a valid email address.<\/em>");
Element.update("label_message", "<em class='flash-error'>Please enter a message.<\/em>");