function main_nav_mouse_over(button_img_file, main_nav_item){
document.getElementById(main_nav_item).src="/img/main_nav/" + button_img_file;
}
function main_nav_mouse_out(button_img_file, main_nav_item){
document.getElementById(main_nav_item).src="/img/main_nav/" + button_img_file;
}
function load_button_img_file() {
  var button_name = [];
  button_name[0] = "mainnav_home_hover.gif";
  button_name[1] = "mainnav_the_team_hover.gif";
  button_name[2] = "mainnav_services_hover.gif";
  button_name[3] = "mainnav_resources_hover.gif";
  button_name[4] = "mainnav_testimonials_hover.gif";
  button_name[5] = "mainnav_contact_info_hover.gif";
  for ( index in button_name ) {
    obj_button_image = new Image();
    obj_button_image.src = "/img/main_nav/" + button_name[index];
  }
}