var BackBUTTON_UP   = "http://gyu-tan.net/image/icon/icon/back_up.gif";
var BackBUTTON_DOWN = "http://gyu-tan.net/image/icon/icon/back_down.gif";
var HomeBUTTON_UP   = "http://gyu-tan.net/image/icon/icon/home_up.gif";
var HomeBUTTON_DOWN = "http://gyu-tan.net/image/icon/icon/home_down.gif";
function PAGEButtonUD(NAME,UD) {
	if (NAME == "BACK") {
		if (UD == "up") {
			document.BackBUTTON.src=BackBUTTON_UP;
		} else {
			document.BackBUTTON.src=BackBUTTON_DOWN;
		}
	} else {
		if (UD == "up") {
			document.HomeBUTTON.src=HomeBUTTON_UP;
		} else {
			document.HomeBUTTON.src=HomeBUTTON_DOWN;
		}
	}
}