if (document.images) {
  //main menu images
  var what = new Image();
  what.src = "images/but_what_we_do.gif";
  var what_over = new Image();
  what_over.src = "images/but_what_we_do_over.gif";
  var services = new Image();
  services.src = "images/but_prod_services.gif";
  var services_over = new Image();
  services_over.src = "images/but_prod_services_over.gif";
  var sales = new Image();
  sales.src = "images/but_sales.gif";
  var sales_over = new Image();
  sales_over.src = "images/but_sales_over.gif";
  var rentals = new Image();
  rentals.src = "images/but_rentals.gif";
  var rentals_over = new Image();
  rentals_over.src = "images/but_rentals_over.gif";
  var contact = new Image();
  contact.src = "images/but_contact.gif";
  var contact_over = new Image();
  contact_over.src = "images/but_contact_over.gif";
  var display = new Image();
  display.src = "images/but_display.gif";
  var display_over = new Image();
  display_over.src = "images/but_display_over.gif";
  var email = new Image();
  email.src = "images/bottom_info2.gif";
  var email_over = new Image();
  email_over.src = "images/bottom_info2_over.gif";
  //main menu images end
  // rollover function
  function rollover(imgName) {
    document.getElementById(imgName).src = eval(imgName + "_over").src;
  }
  function rollout(imgName) {
	document.getElementById(imgName).src = eval(imgName).src;
  }
}
function rollover_txtlink(link_id) {
	var plus_id=link_id+"_plus";
	document.getElementById(plus_id).className = "visible_plus";
 }
 function rollout_txtlink(link_id) {
	var plus_id=link_id+"_plus";
	document.getElementById(plus_id).className = "hidden_plus";
 }