CSS in Ajax

Question

Hi

     I am working in ajax and face a probleam in ajax design with CSS .How can use css with ajax.
.ratingStar {
font-size: 0pt;
width: 31px;
height: 30px;
margin: 0px;
padding: 0px;
cursor: pointer;
display: block;
background-repeat: no-repeat;
}
.filledRatingStar
{
    background-image:url(image/images.jpeg);

}