if (document.images) {
  item1= new Image();
  item1.src="images/design/menu_biography_hover.jpg";
  item2= new Image();
  item2.src="images/design/menu_books_hover.jpg";
  item3= new Image();
  item3.src="images/design/menu_samples_hover.jpg";
  item4= new Image();
  item4.src="images/design/menu_welcome_hover.jpg";
  item5= new Image();
  item5.src="images/design/menu_shop_hover.jpg";
  item6= new Image();
  item6.src="images/design/menu_FAQ_hover.jpg";
  item7= new Image();
  item7.src="images/design/menu_e-mail_hover.jpg";
}

if (document.getElementById) {

function swapIn(string) {
if ((string) == '1') document.getElementById("biography").src='images/design/menu_biography_hover.jpg';
if ((string) == '2') document.getElementById("books").src='images/design/menu_books_hover.jpg';
if ((string) == '3') document.getElementById("samples").src='images/design/menu_samples_hover.jpg';
if ((string) == '4') document.getElementById("welcome").src='images/design/menu_welcome_hover.jpg';
if ((string) == '5') document.getElementById("shop").src='images/design/menu_shop_hover.jpg';
if ((string) == '6') document.getElementById("FAQ").src='images/design/menu_FAQ_hover.jpg';
if ((string) == '7') document.getElementById("e-mail").src='images/design/menu_e-mail_hover.jpg';
}

function swapOut(string) {
if ((string) == '1') document.getElementById("biography").src='images/design/menu_biography.jpg';
if ((string) == '2') document.getElementById("books").src='images/design/menu_books.jpg';
if ((string) == '3') document.getElementById("samples").src='images/design/menu_samples.jpg';
if ((string) == '4') document.getElementById("welcome").src='images/design/menu_welcome.jpg';
if ((string) == '5') document.getElementById("shop").src='images/design/menu_shop.jpg';
if ((string) == '6') document.getElementById("FAQ").src='images/design/menu_FAQ.jpg';
if ((string) == '7') document.getElementById("e-mail").src='images/design/menu_e-mail.jpg';
}

}