// Image preloader to eliminate image loading lag on mouse overs
var mainImage1 = new Image(); mainImage1.src = "images/header_maintab_blogs.gif";
var mainImage1on = new Image(); mainImage1on.src = "images/header_maintab_blogs_on.gif";
var mainImage2 = new Image(); mainImage2.src = "images/header_maintab_news.gif";
var mainImage2on = new Image(); mainImage2on.src = "images/header_maintab_news_on.gif";
var mainImage3 = new Image(); mainImage3.src = "images/header_maintab_listing.gif";
var mainImage3on = new Image(); mainImage3on.src = "images/header_maintab_listing_on.gif";
var mainImage4 = new Image(); mainImage4.src = "images/header_maintab_help.gif";
var mainImage4on = new Image(); mainImage4on.src = "images/header_maintab_help_on.gif";
var mainImage5 = new Image(); mainImage5.src = "images/header_maintab_trainer.gif";
var mainImage5on = new Image(); mainImage5on.src = "images/header_maintab_trainer_on.gif";
var mainImage6 = new Image(); mainImage6.src = "images/header_maintab_client.gif";
var mainImage6on = new Image(); mainImage6on.src = "images/header_maintab_client_on.gif";
var mainImage7 = new Image(); mainImage7.src = "images/header_maintab_refer.gif";
var mainImage7on = new Image(); mainImage7on.src = "images/header_maintab_refer_on.gif";
var secImage1 = new Image(); secImage1.src = "images/header_sectab_nutrition.gif";
var secImage1on = new Image(); secImage1on.src = "images/header_sectab_nutrition_on.gif";
var secImage2 = new Image(); secImage2.src = "images/header_sectab_articles.gif";
var secImage2on = new Image(); secImage2on.src = "images/header_sectab_articles_on.gif";
var secImage3 = new Image(); secImage3.src = "images/header_sectab_skincare.gif";
var secImage3on = new Image(); secImage3on.src = "images/header_sectab_skincare_on.gif";
var secImage4 = new Image(); secImage4.src = "images/header_sectab_equipment.gif";
var secImage4on = new Image(); secImage4on.src = "images/header_sectab_equipment_on.gif";

// Image swapping functions for mouse overs
function swapImage (imageName) {
  document.getElementById(imageName).src = "images/header_"+imageName+".gif";
}
function swapImageOn (imageName) {
  document.getElementById(imageName).src = "images/header_"+imageName+"_on.gif";
}