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

}

function change( imgName, imgSrc )
{
 if ( document.images && (preloadFlag == true) )
 {
   document[imgName].src = imgSrc ;
 }
}

var preloadFlag = false;
function loadImages()
{
 if (document.images)
 {
  contact_button_select = newImage( "/images/site/contact_button_select.gif" );
  home_button_select = newImage( "/images/site/home_button_select.gif" );
  map_button_select = newImage( "/images/site/map_button_select.gif" );
  
  
  preloadFlag = true;
 }
}