var topNav_home = document.getElementById("td_navApp4Lease");
var topNav_products = document.getElementById("td_navResLease");
var topNav_commercial = document.getElementById("td_navCommLease");
var topNav_residential = document.getElementById("td_navCommSales");
var topNav_aboutUs = document.getElementById("td_navAboutUs");




switch(currPage){
case "":
  topNav_home.style.backgroundImage = "url(images/appliancesforlease.jpg)";
  break; 
case "products":
  topNav_home.style.backgroundImage = "url(images/topNav_appliancesforlease_on.jpg)";
  break; 
case "residential":
  topNav_products.style.backgroundImage = "url(images/topNav_residentialleasing_on.jpg)";
  break;    
case "commercial":
  topNav_commercial.style.backgroundImage = "url(images/topNav_commercialleasing_on.jpg)";
  break;
case "commercialsales":
  topNav_residential.style.backgroundImage = "url(images/topNav_commercialsales_on.jpg)";
  break;
case "about":
  topNav_aboutUs.style.backgroundImage = "url(images/topNav_aboutUs_on.jpg)";
  break;
}