function swapon1() { document.img1.src="/img/navigr1.gif"; }
function swapoff1() { document.img1.src="/img/navig1.gif"; }

function swapon2() { document.img2.src="/img/navigr2.gif"; }
function swapoff2() { document.img2.src="/img/navig2.gif"; }

function swapon3() { document.img3.src="/img/navigr3.gif"; }
function swapoff3() { document.img3.src="/img/navig3.gif"; }

function swapon4() { document.img4.src="/img/navigr4.gif"; }
function swapoff4() { document.img4.src="/img/navig4.gif"; }

function swapon5() { document.img5.src="/img/navigr5.gif"; }
function swapoff5() { document.img5.src="/img/navig5.gif"; }

function swapon6() { document.img6.src="/img/navigr6.gif"; }
function swapoff6() { document.img6.src="/img/navig6.gif"; }

function swapon7() { document.img7.src="/img/navigr7.gif"; }
function swapoff7() { document.img7.src="/img/navig7.gif"; }

function swapon8() { document.img8.src="/img/navigr8.gif"; }
function swapoff8() { document.img8.src="/img/navig8.gif"; }

function swapon9() { document.img9.src="/img/navigr9.gif"; }
function swapoff9() { document.img9.src="/img/navig9.gif"; }

function swapon10() { document.img10.src="/img/navigr10.gif"; }
function swapoff10() { document.img10.src="/img/navig10.gif"; }

function swapon11() { document.img11.src="/img/navigr11.gif"; }
function swapoff11() { document.img11.src="/img/navig11.gif"; }

function swapon13() { document.img13.src="/img/navigr13.gif"; }
function swapoff13() { document.img13.src="/img/navig13.gif"; }