function changeImage() {
          newImage = "url(images/nav_r1_c1_f2.jpg)";
          document.getElementById('MenuImage1').style.backgroundImage = newImage;
        }
		
        function changeImage2() {
          newImage = "url(images/nav_r1_c1.jpg)";
          document.getElementById('MenuImage1').style.backgroundImage = newImage;
        }

        function changeImage3() {
          newImage = "url(images/nav_r1_c2_f2.jpg)";
          document.getElementById('MenuImage2').style.backgroundImage = newImage;
        }
		
        function changeImage4() {
          newImage = "url(images/nav_r1_c2.jpg)";
          document.getElementById('MenuImage2').style.backgroundImage = newImage;
        }
	  
        function changeImage5() {
          newImage = "url(images/nav_r1_c3_f2.jpg)";
          document.getElementById('MenuImage3').style.backgroundImage = newImage;
        }
		
        <!--
        function changeImage6() {
          newImage = "url(images/nav_r1_c3.jpg)";
          document.getElementById('MenuImage3').style.backgroundImage = newImage;
        }
	  
        <!--
        function changeImage7() {
          newImage = "url(images/nav_r1_c4_f2.jpg)";
          document.getElementById('MenuImage4').style.backgroundImage = newImage;
        }
		
        function changeImage8() {
          newImage = "url(images/nav_r1_c4.jpg)";
          document.getElementById('MenuImage4').style.backgroundImage = newImage;
        }
	  
        function changeImage9() {
          newImage = "url(images/nav_r1_c5_f2.jpg)";
          document.getElementById('MenuImage5').style.backgroundImage = newImage;
        }
		
        function changeImage10() {
          newImage = "url(images/nav_r1_c5.jpg)";
          document.getElementById('MenuImage5').style.backgroundImage = newImage;
        }