if (document.images) {
menu_B1_off = new Image(); menu_B1_off.src = "menu_B1.gif"
menu_B1_over = new Image(); menu_B1_over.src = "menu_B1_over.gif"
menu_B2_off = new Image(); menu_B2_off.src = "menu_B2.gif"
menu_B2_over = new Image(); menu_B2_over.src = "menu_B2_over.gif"
menu_B3_off = new Image(); menu_B3_off.src = "menu_B3.gif"
menu_B3_over = new Image(); menu_B3_over.src = "menu_B3_over.gif"
menu_B4_off = new Image(); menu_B4_off.src = "menu_B4.gif"
menu_B4_over = new Image(); menu_B4_over.src = "menu_B4_over.gif"
}

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

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