normal_image1 = new Image();
normal_image1.src = "images/nav_home.jpg";

mouseover_image1 = new Image();
mouseover_image1.src = "images/nav_home_roll.jpg";

normal_image2 = new Image();
normal_image2.src = "images/nav_plumbing.jpg";

mouseover_image2 = new Image();
mouseover_image2.src = "images/nav_plumbing_roll.jpg";

normal_image3 = new Image();
normal_image3.src = "images/nav_site.jpg";

mouseover_image3 = new Image();
mouseover_image3.src = "images/nav_site_roll.jpg";

normal_image4 = new Image();
normal_image4.src = "images/nav_contact.jpg";

mouseover_image4 = new Image();
mouseover_image4.src = "images/nav_contact_roll.jpg";

normal_image5 = new Image();
normal_image5.src = "images/nav_specials.jpg";

mouseover_image5 = new Image();
mouseover_image5.src = "images/nav_specials_roll.jpg";

normal_image6 = new Image();
normal_image6.src = "images/nav_service.jpg";

mouseover_image6 = new Image();
mouseover_image6.src = "images/nav_service_roll.jpg";

normal_image7 = new Image();
normal_image7.src = "images/nav_hvac.jpg";

mouseover_image7 = new Image();
mouseover_image7.src = "images/nav_hvac_roll.jpg";

normal_image8 = new Image();
normal_image8.src = "images/nav_hvac.jpg";

mouseover_image8 = new Image();
mouseover_image8.src = "images/nav_hvac_roll.jpg";

normal_image9 = new Image();
normal_image9.src = "images/nav_hvac2.jpg";

mouseover_image9 = new Image();
mouseover_image9.src = "images/nav_hvac_roll2.jpg";

normal_image10 = new Image();
normal_image10.src = "images/nav_plumbing2.jpg";

mouseover_image10 = new Image();
mouseover_image10.src = "images/nav_plumbing_roll2.jpg";

function swap(){
if (document.images){
for (var x=0;
x<swap.arguments.length;
x+=2) {
document[swap.arguments[x]].src = eval(swap.arguments[x+1] + ".src");
}
}
}