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";}