if (document.images)
{
   var home_off = new Image(); home_off.src = "/images/off_home.gif";
   var home_on = new Image(); home_on.src = "/images/on_home.gif"; 
   
   var plans_off = new Image(); plans_off.src = "/images/off_plans.gif";
   var plans_on = new Image(); plans_on.src = "/images/on_plans.gif"; 
   
   var carriers_off = new Image(); carriers_off.src = "/images/off_carriers.gif";
   var carriers_on = new Image(); carriers_on.src = "/images/on_carriers.gif"; 
				
   var contact_off = new Image(); contact_off.src = "/images/off_contact.gif";
   var contact_on = new Image(); contact_on.src = "/images/on_contact.gif"; 
   
   var testimonials_off = new Image(); testimonials_off.src = "/images/off_testimonials.gif";
   var testimonials_on = new Image(); testimonials_on.src = "/images/on_testimonials.gif"; 
   
   var about_off = new Image(); about_off.src = "/images/off_aboutus.gif";
   var about_on = new Image(); about_on.src = "/images/on_aboutus.gif"; 
   
   var news_off = new Image(); news_off.src = "/images/off_news.gif";
   var news_on = new Image(); news_on.src = "/images/on_news.gif"; 
   
   var terminology_off = new Image(); terminology_off.src = "/images/off_terminology.gif";
   var terminology_on = new Image(); terminology_on.src = "/images/on_terminology.gif"; 
   
   var travel_off = new Image(); travel_off.src = "/images/off_travel.gif";
   var travel_on = new Image(); travel_on.src = "/images/on_travel.gif"; 

}
function imgOn(imgName) {
    if (document.images) {
   document.images[imgName].src = eval(imgName + "_on.src") ;
    }
}


function imgOff(imgName) {
    if (document.images) {
   document.images[imgName].src = eval(imgName + "_off.src") ;
    }
}