Rollimage = new Array()

Rollimage[0] = new Image(211,56)
Rollimage[0].src = "/img/about_book_btn.png"

Rollimage[1] = new Image(211,56)
Rollimage[1].src = "/img/about_book_btn_hover.png"

Rollimage[2] = new Image(211,56)
Rollimage[2].src = "/img/read_prologue_btn.png"

Rollimage[3] = new Image(211,56)
Rollimage[3].src = "/img/read_prologue_btn_hover.png"

function aboutBookOver() {
	document.about_book_btn.src = Rollimage[1].src;
	return true;
}

function aboutBookOut() {
	document.about_book_btn.src = Rollimage[0].src;
	return true;
}

function readPrologueOver() {
	document.read_chapter_btn.src = Rollimage[3].src;
	return true;
}

function readPrologueOut() {
	document.read_chapter_btn.src = Rollimage[2].src;
	return true;
}