is toggleClass what I need to change this border css??

is toggleClass what I need to change this border css??

I have this css which MUST be changed by jQ since it's !important and can't be changed any other way, the css is written exactly THIS way in the php file (I know, poor code not to have a blank space before the !important, not MY code though):

.recaptchatable {
line-height: 1em;
border: 1px solid #dfdfdf!important;
}

What's the correct jQ to use: toggleClass, what??
I want border to become none; instaed of a solid line.

Thank you, Tom

P.S. Any kind of code that will change the border attribute to none; !important will work.
P.P.S. note to self: need same change for #recaptcha_image