function swapOn( imgObj ) {
    if ( document.images ) {
      eval( 'document.' + imgObj + 'Img.src = ' + imgObj + 'On.src' );
    }
   }
   function swapOff( imgObj ) {
    if ( document.images ) {
      eval( 'document.' + imgObj + 'Img.src = ' + imgObj + 'Off.src' );
    }
   }
   function preload( imgObj, imgSrc ) {
    if ( document.images ) {
      eval( imgObj + ' = new Image()' )
      eval( imgObj + '.src = "'+imgSrc+'"' )
    }
   }
   var imgRoot = document.all.SPACERIMG.src;
   preload( 'galacticaOn', imgRoot.replace('http://www.battlestar-galactica.org/images/spacer.gif', 'http://www.battlestar-galactica.org/images/home_goto_bg_on.gif' ) );
   preload( 'galacticaOff', imgRoot.replace('http://www.battlestar-galactica.org/images/spacer.gif', 'http://www.battlestar-galactica.org/images/home_goto_bg_off.gif' ) );
   preload( 'galactica80On', imgRoot.replace('http://www.battlestar-galactica.org/images/spacer.gif', 'http://www.battlestar-galactica.org/images/home_goto_bg80_on.gif' ) );
   preload( 'galactica80Off', imgRoot.replace('http://www.battlestar-galactica.org/images/spacer.gif', 'http://www.battlestar-galactica.org/images/home_goto_bg80_off.gif' ) );
   preload( 'galactica99On', imgRoot.replace('http://www.battlestar-galactica.org/images/spacer.gif', 'http://www.battlestar-galactica.org/images/home_goto_bg99_on.gif' ) );
   preload( 'galactica99Off', imgRoot.replace('http://www.battlestar-galactica.org/images/spacer.gif', 'http://www.battlestar-galactica.org/images/home_goto_bg99_off.gif' ) );
   preload( 'galactica01On', imgRoot.replace('http://www.battlestar-galactica.org/images/spacer.gif', 'http://www.battlestar-galactica.org/images/home_goto_bg01_on.gif' ) );
   preload( 'galactica01Off', imgRoot.replace('http://www.battlestar-galactica.org/images/spacer.gif', 'http://www.battlestar-galactica.org/images/home_goto_bg01_off.gif' ) );
   preload( 'galactica03On', imgRoot.replace('http://www.battlestar-galactica.org/images/spacer.gif', 'http://www.battlestar-galactica.org/images/home_goto_bg03_on.gif' ) );
   preload( 'galactica03Off', imgRoot.replace('http://www.battlestar-galactica.org/images/spacer.gif', 'http://www.battlestar-galactica.org/images/home_goto_bg03_off.gif' ) );


   function getHeader()
   {
      var si = Math.round(Math.random()*4);
      var series = ["BSG","G80","NEW","REV","RAN"];

      var ti = Math.round(Math.random()*1);
      var types = ["cast","ship"];

      return "http://www.battlestar-galactica.org/images/" + series[si] + "_" + types[ti] + ".gif";
   }