jQuery for moving background alone

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  script for moving bg alone like cloud moving:

<script type="text/javascript" charset="utf-8">
   var scrollSpeed = 50;   // Speed in milliseconds
   var step = 1;     // How many pixels to move per step
   var current = 0;   // The current pixel row
   var imageWidth = 2247;  // Background image width
   var headerWidth = 2000;  // How wide the header is.
   
   //The pixel row where to start a new loop
   var restartPosition = -(imageWidth - headerWidth);
   
   function scrollBg(){
    //Go to next pixel row.
    current -= step;
    
    //If at the end of the image, then go to the top.
    if (current == restartPosition){
     current = 0;
    }
    
    //Set the CSS of the header.
    $('body').css("background-position",current+"px 0");
   }
   
   //Calls the scrolling function repeatedly
   var init = setInterval("scrollBg()", scrollSpeed);
 </script>