if (document.images) {

// preload inactive images
nav1= new Image();
nav1.src="email.png";

nav2 = new Image();
nav2.src="home.png";

nav3 = new Image();
nav3.src="aboutus.png";

nav4= new Image();
nav4.src="customerservice.png";

nav5=new Image();
nav5.src="quotes.png";

nav6=new Image();
nav6.src="links.png";

nav7=new Image();
nav7.src="rmv.png";

insnav1=new Image();
insnav1.src="inshomeproperty.png";

insnav2=new Image();
insnav2.src="insbusiness.png";

insnav3=new Image();
insnav3.src="insauto.png";

insnav4=new Image();
insnav4.src="insboat.png";

insnav5=new Image();
insnav5.src="insforms.png";

insnav6=new Image();
insnav6.src="inslife.png";

// preload active images
nav1on= new Image();
nav1on.src="email2.png";

nav2on = new Image();
nav2on.src = "home2.png";

nav3on = new Image();
nav3on.src = "aboutus2.png";

nav4on= new Image();
nav4on.src = "customerservice2.png";

nav5on=new Image();
nav5on.src="quotes2.png";

nav6on=new Image();
nav6on.src="links2.png";

nav7on=new Image();
nav7on.src="rmv2.png";

insnav1on=new Image();
insnav1on.src="inshomeproperty2.png";

insnav2on=new Image();
insnav2on.src="insbusiness2.png";

insnav3on=new Image();
insnav3on.src="insauto2.png";

insnav4on=new Image();
insnav4on.src="insboat2.png";

insnav5on=new Image();
insnav5on.src="insforms2.png";

insnav6on=new Image();
insnav6on.src="inslife2.png";
}

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

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