[Plugin: Contact Form 7] Css style submit button after send

Hey,
So I figured this out. I gave the submit button an id and class like so.
[submit class:firstclass id:form-submit ” “]

I went into my css and did this:

.firstclass {
background-image: url(“/images/1.jpg”);
background-repeat:no-repeat;
background-color:transparent;
height:50px;
width:100px;
border:0px;
}

.secondclass {
background-image: url(“/images/2.jpg”);
background-repeat:no-repeat;
background-color:transparent;
height:50px;
width:100px;
border:0px;
}

The jquery I used was the library
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
and then:

<script type="text/javascript" charset="utf-8">
    $(document).ready(function(){
        $('#form-submit').click(function() {
                $(this).removeClass("firstclass");
                $(this).addClass("secondclass");
	})
    });
</script>