function changeButton1() { a = new Image(); a.src = "images/Home-b.png"; (new Image()).src = "images/Home-b2.png"; }

function changeButton2() { a = new Image(); a.src = "images/School-b.png"; (new Image()).src = "images/School-b2.png"; }

function changeButton3() { a = new Image(); a.src = "images/Guide-b.png"; (new Image()).src = "images/Guide-b2.png"; }

function changeButton4() { a = new Image(); a.src = "images/BBC-b.png"; (new Image()).src = "images/BBC-b2.png"; }

function changeButton5() { a = new Image(); a.src = "images/Photo-b.png"; (new Image()).src = "images/Photo-b2.png"; }

function changeButton6() { a = new Image(); a.src = "images/Blog-b.png"; (new Image()).src = "images/Blog-b2.png"; }

function changeButton7() { a = new Image(); a.src = "images/Link-b.png"; (new Image()).src = "images/Link-b2.png"; }

function changeButton8() { a = new Image(); a.src = "images/About-b.png"; (new Image()).src = "images/About-b2.png"; }

function changeButton9() { a = new Image(); a.src = "images/Home-b3.png"; (new Image()).src = "images/Home-b4.png"; }

function changeButton10() { a = new Image(); a.src = "images/School-b3.png"; (new Image()).src = "images/School-b4.png"; }

function changeButton11() { a = new Image(); a.src = "images/Guide-b3.png"; (new Image()).src = "images/Guide-b4.png"; }

function changeButton12() { a = new Image(); a.src = "images/BBC-b3.png"; (new Image()).src = "images/BBC-b4.png"; }

function changeButton13() { a = new Image(); a.src = "images/Photo-b3.png"; (new Image()).src = "images/Photo-b4.png"; }

function changeButton14() { a = new Image(); a.src = "images/Blog-b3.png"; (new Image()).src = "images/Blog-b4.png"; }

function changeButton15() { a = new Image(); a.src = "images/Link-b3.png"; (new Image()).src = "images/Link-b4.png"; }

function changeButton16() { a = new Image(); a.src = "images/About-b3.png"; (new Image()).src = "images/About-b4.png"; }