if (document.images) {
    submitcvbuttonup       = new Image();
    submitcvbuttonup.src   = "site_images/tools_nav/images/toolsnav_submitcv.gif" ;
    submitcvbuttondown     = new Image() ;
    submitcvbuttondown.src = "site_images/tools_nav/images/toolsnav_submitcv_over.gif" ;

    homebuttonup       = new Image();
    homebuttonup.src   = "site_images/tools_nav/images/toolsnav_home.gif" ;
    homebuttondown     = new Image() ;
    homebuttondown.src = "site_images/tools_nav/images/toolsnav_home_over.gif" ;

   contactusbuttonup       = new Image();
    contactusbuttonup.src   = "site_images/tools_nav/images/toolsnav_contactus.gif" ;
    contactusbuttondown     = new Image() ;
    contactusbuttondown.src = "site_images/tools_nav/images/toolsnav_contactus_over.gif" ;


  }
  function buttondown( buttonname )
  {
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "down.src" );
    }
  }
  function buttonup ( buttonname )
  {
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "up.src" );
    }
  }