if (document.images) {
				image1on = new Image();
				image1on.src = "images/btn_forbuyers_on.gif";
				image2on = new Image();
				image2on.src = "images/btn_forsellers_on.gif";
               	image3on = new Image();
               	image3on.src = "images/btn_contactme_on.gif";
				
               	image1off = new Image();
               	image1off.src = "images/btn_forbuyers_off.gif";
				image2off = new Image();
               	image2off.src = "images/btn_forsellers_off.gif";
               	image3off = new Image();
               	image3off.src = "images/btn_contactme_off.gif";

}

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  } // end of document.images if
} // end of mouseover sub-navigation