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

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

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

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

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

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

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

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

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

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

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