function homein(){
document.getElementById("homeb").src="./content/home1.png";
}
function homeout(){
document.getElementById("homeb").src="./content/home2.png";
}

function aboutin(){
document.getElementById("aboutb").src="./content/about1.png";
}

function aboutout(){
document.getElementById("aboutb").src="./content/about2.png";
}

function prepin(){
document.getElementById("prepb").src="./content/prep1.png";
}

function prepout(){
document.getElementById("prepb").src="./content/prep2.png";
}

function menuin(){
document.getElementById("menub").src="./content/menu1.png";
}

function menuout(){
document.getElementById("menub").src="./content/menu2.png";
}

function meetin(){
document.getElementById("meetb").src="./content/meet1.png";
}

function meetout(){
document.getElementById("meetb").src="./content/meet2.png";
}

function howin(){
document.getElementById("howb").src="./content/how1.png";
}

function howout(){
document.getElementById("howb").src="./content/how2.png";
}

function contactin(){
document.getElementById("contactb").src="./content/contact1.png";
}

function contactout(){
document.getElementById("contactb").src="./content/contact2.png";
}

function index(){
document.write(index.html)
}