Customize error messafe

Hello, I am newbie. I want to hide the error message "Please fix the following input errors:" and the following error messages. How do i do this ?

Hi. Do you want to hide that block but still have it rendered, or do you want to get rid of it at once?

I want to get rid of these message.

Please fix the following input errors:

Username can not be blank

But please tell me both ways

hey get rid of this line in your _form.php partial

<?php echo $form->errorSummary($model); ?>

Thank you. How do change error messages css and javascript?

check under app/css/form.css there are css rules like the following

div.form .errorSummary

div.form .errorSummary p

div.form .errorSummary ul

list goes on you can figure out