var but1  = new Image(155, 49)
var but2  = new Image(150, 49)
var but3  = new Image(150, 49)
var but4  = new Image(150, 49)
var but5  = new Image(155, 49)

var but1h = new Image(155, 49)
var but2h = new Image(150, 49)
var but3h = new Image(150, 49)
var but4h = new Image(150, 49)
var but5h = new Image(155, 49)
	
but1.src = "images/topmenu/but1.jpg"
but2.src = "images/topmenu/but2.jpg"
but3.src = "images/topmenu/but3.jpg"
but4.src = "images/topmenu/but4.jpg"
but5.src = "images/topmenu/but5.jpg"

but1h.src = "images/topmenu/but1h.jpg"
but2h.src = "images/topmenu/but2h.jpg"
but3h.src = "images/topmenu/but3h.jpg"
but4h.src = "images/topmenu/but4h.jpg"
but5h.src = "images/topmenu/but5h.jpg"

function hover_on(b) {
	b.childNodes[0].src = b.childNodes[0].src.replace(/.jpg/, "h.jpg");
}

function hover_off(b) {
	b.childNodes[0].src = b.childNodes[0].src.replace(/h.jpg/, ".jpg");
}