function swapon1()  {document.img1.src="menu_btn_home_on.gif"; }
function swapoff1()  {document.img1.src="menu_btn_home_off.gif"; }
function swapon2()  {document.img2.src="menu_btn_about_on.gif"; }
function swapoff2()  {document.img2.src="menu_btn_about_off.gif"; }
function swapon3()  {document.img3.src="menu_btn_books_on.gif"; }
function swapoff3()  {document.img3.src="menu_btn_books_off.gif"; }
function swapon4()  {document.img4.src="menu_btn_gallery_on.gif"; }
function swapoff4()  {document.img4.src="menu_btn_gallery_off.gif"; }
function swapon5()  {document.img5.src="menu_btn_auctions_on.gif"; }
function swapoff5()  {document.img5.src="menu_btn_auctions_off.gif"; }
function swapon6()  {document.img6.src="menu_btn_store_on.gif"; }
function swapoff6()  {document.img6.src="menu_btn_store_off.gif"; }
function swapon7()  {document.img7.src="menu_btn_club_on.gif"; }
function swapoff7()  {document.img7.src="menu_btn_club_off.gif"; }