function imgRestore(img){


  if (img!='app') {
     document.getElementById('app').src = "images/topnav/approach_up.gif";
  }

  if  (img!='ftp') {
     document.getElementById('ftp').src = "images/topnav/ftp_up.gif";
  }

  if  (img!='about') {
     document.getElementById('about').src = "images/topnav/about_up.gif";
  }

  if  (img!='quote') {
     document.getElementById('quote').src = "images/topnav/request_up.gif";
  }

  if  (img!='links') {
     document.getElementById('links').src = "images/topnav/links_up.gif";
  }

  if  (img!='contact') {
     document.getElementById('contact').src = "images/topnav/contact_up.gif";
  }

}


function swapImage(img) {

  if (img=='app') {
     document.getElementById(img).src = "images/topnav/approach_down.gif";
  } else if  (img=='ftp') {
     document.getElementById(img).src = "images/topnav/ftp_down.gif";
  } else if  (img=='about') {
     document.getElementById(img).src = "images/topnav/about_down.gif";
  } else if  (img=='quote') {
     document.getElementById(img).src = "images/topnav/request_down.gif";
  } else if  (img=='links') {
     document.getElementById(img).src = "images/topnav/links_down.gif";
  } else if  (img=='contact') {
     document.getElementById(img).src = "images/topnav/contact_down.gif";
  }

}