function newImage(arg) {
  if (document.images) {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
  }
}

function changeImages() {
  if (document.images && (preloadFlag == true)) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
    }
  }
}

var preloadFlag = false;
function preloadImages() {
  if (document.images) {
    nav_abt_over = newImage("graphics/nav_abt_over.gif");
	nav_prd_over = newImage("graphics/nav_prd_over.gif");
	nav_rec_over = newImage("graphics/nav_rec_over.gif");
	nav_wnw_over = newImage("graphics/nav_wnw_over.gif");
	nav_cnt_over = newImage("graphics/nav_cnt_over.gif");
	
	typesub_fmt_over = newImage("graphics/typesub_fmt_over.gif");
	typesub_hst_over = newImage("graphics/typesub_hst_over.gif");
	typesub_use_over = newImage("graphics/typesub_use_over.gif");
	typesub_stg_over = newImage("graphics/typesub_stg_over.gif");
	typesub_prg_over = newImage("graphics/typesub_prg_over.gif");
	
	subnav_rec_ov_over = newImage("graphics/subnav_rec_ov_over.gif");
	subnav_rec_type_over = newImage("graphics/subnav_rec_type_over.gif");
	subnav_rec_app_over = newImage("graphics/subnav_rec_app_over.gif");
	subnav_rec_seg_over = newImage("graphics/subnav_rec_seg_over.gif");
	subnav_rec_prng_over = newImage("graphics/subnav_rec_prng_over.gif");
	subnav_rec_faq_over = newImage("graphics/subnav_rec_faq_over.gif");
	subnav_rec_indtrnd_over = newImage("graphics/subnav_rec_indtrnd_over.gif");
	subnav_rec_real_over = newImage("graphics/subnav_rec_real_over.gif");
	
	subnav_abt_ML_over = newImage("graphics/subnav_abt_ML_over.gif");
	subnav_abt_OB_over = newImage("graphics/subnav_abt_OB_over.gif");
	subnav_abt_cab_over = newImage("graphics/subnav_abt_cab_over.gif");
	
	subnav_cnt_ci_over = newImage("graphics/subnav_cnt_ci_over.gif");
	subnav_cnt_sl_over = newImage("graphics/subnav_cnt_sl_over.gif");
	subnav_cnt_cr_over = newImage("graphics/subnav_cnt_cr_over.gif");
	
	subnav_wn_LN_over = newImage("graphics/subnav_wn_LN_over.gif");
	subnav_wn_FP_over = newImage("graphics/subnav_wn_FP_over.gif");
	
	
    preloadFlag = true;
  }
}