Background image clickable

Hi Experts,
I had look at following example.
http://www.position-relative.com/tutorials/tute1_css_bg_image.php

I'm trying to make clickable on following site's left and right banners which are under background image.
http://ddcdev.networkvideo.com.au/

But when I zoom or when I view under higher resolution it's not working properly. It's more into right and left , it's going out of the image.
Is there anyway that I can try to put positions from center , instead of right/left.

BR Dushan.

#LEFT{
    position: absolute;
    width: 130px;    /* width of the logo */
    height: 450px;   /* height of the logo */
    top: 0; left: 0; /* top-left corner of logo */
    border: 0;
    float: left;
}

#RIGHT {
    position: absolute;
    width: 130px;    /* width of the logo */
    height: 450px;   /* height of the logo */
    top: 0; right: 0; /* top-left corner of logo */
    border: 0;
    float: right;
}

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