Maybe something like this will help

Here is a sample of the code it will generate

<script language="JavaScript">"
function preloader()
{
      // counter    
      var i = 0;

      // create object    
      imageObj = new Image();
     
      // set image list    
      images = new Array();
images[0]="http:\\webnamehere.com\your files location ...\your pano name1.jpg"
images[1]="http:\\webnamehere.com\your files location ...\your pano name2.jpg"
images[2]="http:\\webnamehere.com\your files location ...\your pano name3.jpg"
images[3]="http:\\webnamehere.com\your files location ...\your pano name4.jpg"
images[4]="http:\\webnamehere.com\your files location ...\your pano name5.jpg"
images[5]="http:\\webnamehere.com\your files location ...\your pano name6.jpg"
  

 // start preloading
      for(i=0; i<=6; i++)
       {
           imageObj.src=images;
       }
}
</script>