function turn_off(ImageName) {
	if (document.images != null) {
		document[ImageName].src = eval(ImageName + ".src");
	}
}

function turn_over(ImageName) {
	if (document.images != null) {
		document[ImageName].src = eval(ImageName + "_on.src");
	}
}

if (document.images) {
next_but = new Image(); next_but.src = "http://www.hillsarcherstudios.co.uk/images/next_but.gif";
next_but_on = new Image(); next_but_on.src = "http://www.hillsarcherstudios.co.uk/images/next_but_on.gif";
back_but = new Image(); back_but.src = "http://www.hillsarcherstudios.co.uk/images/back_but.gif";
back_but_on = new Image(); back_but_on.src = "http://www.hillsarcherstudios.co.uk/images/back_but_on.gif";
but_1 = new Image(); but_1.src = "http://www.hillsarcherstudios.co.uk/images/buttons_1.gif";
but_1_on = new Image(); but_1_on.src = "http://www.hillsarcherstudios.co.uk/images/buttons_1_on.gif";
but_2 = new Image(); but_2.src = "http://www.hillsarcherstudios.co.uk/images/buttons_2.gif";
but_2_on = new Image(); but_2_on.src = "http://www.hillsarcherstudios.co.uk/images/buttons_2_on.gif";
but_3 = new Image(); but_3.src = "http://www.hillsarcherstudios.co.uk/images/buttons_3.gif";
but_3_on = new Image(); but_3_on.src = "http://www.hillsarcherstudios.co.uk/images/buttons_3_on.gif";
but_4 = new Image(); but_4.src = "http://www.hillsarcherstudios.co.uk/images/buttons_4.gif";
but_4_on = new Image(); but_4_on.src = "http://www.hillsarcherstudios.co.uk/images/buttons_4_on.gif";
but_5 = new Image(); but_5.src = "http://www.hillsarcherstudios.co.uk/images/buttons_5.gif";
but_5_on = new Image(); but_5_on.src = "http://www.hillsarcherstudios.co.uk/images/buttons_5_on.gif";

}