if (document.images) {
	img1on = new Image();
	img1on.src = "img_common/menu_1_r.gif";
	img1off = new Image();
	img1off.src = "img_common/menu_1.gif";
	img2on = new Image();
	img2on.src = "img_common/menu_2_r.gif";
	img2off = new Image();
	img2off.src = "img_common/menu_2.gif";
	img3on = new Image();
	img3on.src = "img_common/menu_3_r.gif";
	img3off = new Image();
	img3off.src = "img_common/menu_3.gif";
	img4on = new Image();
	img4on.src = "img_common/menu_4_r.gif";
	img4off = new Image();
	img4off.src = "img_common/menu_4.gif";
	img5on = new Image();
	img5on.src = "img_common/menu_5_r.gif";
	img5off = new Image();
	img5off.src = "img_common/menu_5.gif";
	img6on = new Image();
	img6on.src = "img_common/menu_6_r.gif";
	img6off = new Image();
	img6off.src = "img_common/menu_6.gif";
	img7on = new Image();
	img7on.src = "img_common/menu_7_r.gif";
	img7off = new Image();
	img7off.src = "img_common/menu_7.gif";
	img20on = new Image();
	img20on.src = "img_common/fmenu_1_r.gif";
	img20off = new Image();
	img20off.src = "img_common/fmenu_1.gif";
	img21on = new Image();
	img21on.src = "img_common/fmenu_2_r.gif";
	img21off = new Image();
	img21off.src = "img_common/fmenu_2.gif";
}
function imgOn(imgName) {
	if (document.images) {
		document[imgName].src=eval(imgName+"on.src");
	}
}
function imgOff(imgName) {
	if (document.images) {
		document[imgName].src=eval(imgName+"off.src");
	}
}