if (document.images) {
  whoweare = new Image
  whoweare_on = new Image
  howwework = new Image
  howwework_on = new Image
  contactus = new Image
  contactus_on = new Image
  homebt = new Image
  homebt_on = new Image
  
  whoweare.src = "imgs/who_we_are.gif"
  whoweare_on.src = "imgs/who_we_are_on.gif"
  howwework.src = "imgs/how_we_work.gif"
  howwework_on.src = "imgs/how_we_work_on.gif"
  contactus.src = "imgs/contact_us.gif"
  contactus_on.src = "imgs/contact_us_on.gif"
  homebt.src = "imgs/home.gif"
  homebt_on.src = "imgs/home_on.gif"
}
else {
  whoweare = ""
  whoweare_on = " "
  howwework = " "
  contactus = " "
  homebt = " "
  document.button = " "
}