function newImage( imgSrc ){
 
 var imgName = new Image();
 imgName.src = imgSrc;
 
 return imgName;

}

function change( imgName, loc )
{
 if ( document.images && (preloadFlag == true) )
 {

   document[imgName].src = loc;

 }
}


var preloadFlag = false;
function loadImages()
{
 if (document.images)
 {
 
  //****Edit this list to include vertical rollover images ****
  //****Example: aboutus_over = newImage( "images/menu_aboutus_over.gif" );
  default_over = newImage("http://www.block.net.au/images/topbuttons-home-over.gif");
  contact_over = newImage("http://www.block.net.au/images/topbuttons-contact-over.gif");
  kb_over = newImage("http://www.block.net.au/images/topbuttons-kb-over.gif");
  sitemap_over = newImage("http://www.block.net.au/images/topbuttons-sitemap-over.gif");
  prod_over = newImage("http://www.block.net.au/images/sideprod-over.gif");
  serv_over = newImage("http://www.block.net.au/images/sideserv-over.gif");
  solu_over = newImage("http://www.block.net.au/images/sidesolu-over.gif");
  home_over = newImage("http://www.block.net.au/images/sidehome-over.gif");
 
  preloadFlag = true;
 }
}