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";

 }