Img towards right or left

Hey,

How do I shift the image from right to left and vice versa which has a height of 55 px;

Let's say:
.a{
display: block;
height: 55px;
overflow: hidden;
text-indent: -9999px;
background-image:url(images/logo.jpg) no-repeat;
}

For now my image is on right side:

my site name (logo.jpg)

I want to shift the logo.jpg to the my site name place.

Thanks