#navmenu {
    height: 29px;
    background: url(../images/navbar.jpg) top left repeat-x;
  }
  
  #navbuttons {
    position: relative;
  }

  #navbuttons ul {
  	width: 372px; 
  	height: 29px; 
  	position: absolute; /** Places image at the top of the page **/
  	top: 0px; /** Determines the height from the top of the page **/
  	left: 0px; /** Determines the width from the left of the page **/
  	background: url(../images/navmenu.jpg) no-repeat 0 0;
  	list-style: none;
  	margin: 0; padding: 0;
  }
  
  #navbuttons li {
  	display: inline;
  }
  
  #navbuttons li.nav_welcome a:link, #navbuttons li.nav_welcome a:visited {
  	border: none;
  	width: 89px; /** width of the button in active state **/
  	height: 29px; /** height of the button in active state **/
  	display: block; 
  	position: absolute; 
  	top: 0; 
  	text-indent: -7000px; /** any large number value just to remove li text from the screen **/
  	outline: none;
  }
  
  #navbuttons li.nav_jobs a:link, #navbuttons li.nav_jobs a:visited {
  	border: none;
  	width: 54px; /** width of the button in active state **/
  	height: 29px; /** height of the button in active state **/
  	display: block; 
  	position: absolute; 
  	top: 0; 
  	text-indent: -7000px; /** Removes li text from the screen **/
  	outline: none;
  }
  
  #navbuttons li.nav_research a:link, #navbuttons li.nav_research a:visited {
  	border: none;
  	width: 95px; /** width of the button in active state **/
  	height: 29px; /** height of the button in active state **/
  	display: block; 
  	position: absolute; 
  	top: 0; 
  	text-indent: -7000px; /** Removes li text from the screen **/
  	outline: none;
  }
  
  #navbuttons li.nav_about a:link, #navbuttons li.nav_about a:visited {
  	border: none;
  	width: 113px; /** width of the button in active state **/
  	height: 29px; /** height of the button in active state **/
  	display: block; 
  	position: absolute; 
  	top: 0; 
  	text-indent: -7000px; /** Removes li text from the screen **/
  	outline: none;
  }
  
  #navbuttons li.nav_welcome a:link, #navbuttons li.nav_welcome a:visited { 
  	left: 0;
  }
  
  #navbuttons li.nav_jobs a:link, #navbuttons li.nav_jobs a:visited { 
  	left: 89px;
  }
  
  #navbuttons li.nav_research a:link, #navbuttons li.nav_research a:visited { 
  	left: 143px;
  }
  
  #navbuttons li.nav_about a:link, #navbuttons li.nav_about a:visited { 
  	left: 238px;
  }
  
  #navbuttons li.nav_welcome a:hover {
  	background: url(../images/navmenu.jpg) no-repeat 0 -29px;
  }
  
  #navbuttons li.nav_jobs a:hover {
  	background: url(../images/navmenu.jpg) no-repeat -89px -29px;
  }
  
  #navbuttons li.nav_research a:hover {
  	background: url(../images/navmenu.jpg) no-repeat -143px -29px;
  }
  
  #navbuttons li.nav_about a:hover {
  	background: url(../images/navmenu.jpg) no-repeat -238px -29px;
  }