if (document.images) {
			var imgOver_sub = new Object();
			imgOver_sub["sub_1"] = new Image();
			imgOver_sub["sub_1"].src = "image/index_sub1_1.png";
			imgOver_sub["sub_2"] = new Image();
			imgOver_sub["sub_2"].src = "image/index_sub2_2.png";
			imgOver_sub["sub_3"] = new Image();
			imgOver_sub["sub_3"].src = "image/index_sub3_3.png";
			imgOver_sub["sub_4"] = new Image();
			imgOver_sub["sub_4"].src = "image/magnet_sub1_1.png";
			imgOver_sub["sub_5"] = new Image();
			imgOver_sub["sub_5"].src = "image/magnet_sub2_2.png";
			imgOver_sub["sub_6"] = new Image();
			imgOver_sub["sub_6"].src = "image/magnet_sub3_3.png";
			imgOver_sub["sub_7"] = new Image();
			imgOver_sub["sub_7"].src = "image/magnet_sub4_4.png";
			imgOver_sub["sub_8"] = new Image();
			imgOver_sub["sub_8"].src = "image/magnet_sub5_5.png";
			imgOver_sub["sub_9"] = new Image();
			imgOver_sub["sub_9"].src = "image/magnet_sub6_6.png";
			
			var imgOut_sub = new Object();
			imgOut_sub["sub_1"] = new Image();
			imgOut_sub["sub_1"].src = "image/index_sub1.png";
			imgOut_sub["sub_2"] = new Image();
			imgOut_sub["sub_2"].src = "image/index_sub2.png";
			imgOut_sub["sub_3"] = new Image();
			imgOut_sub["sub_3"].src = "image/index_sub3.png";
			imgOut_sub["sub_4"] = new Image();
			imgOut_sub["sub_4"].src = "image/magnet_sub1.png";
			imgOut_sub["sub_5"] = new Image();
			imgOut_sub["sub_5"].src = "image/magnet_sub2.png";
			imgOut_sub["sub_6"] = new Image();
			imgOut_sub["sub_6"].src = "image/magnet_sub3.png";
			imgOut_sub["sub_7"] = new Image();
			imgOut_sub["sub_7"].src = "image/magnet_sub4.png";
			imgOut_sub["sub_8"] = new Image();
			imgOut_sub["sub_8"].src = "image/magnet_sub5.png";
			imgOut_sub["sub_9"] = new Image();
			imgOut_sub["sub_9"].src = "image/magnet_sub6.png";
			}
	function over_sub(id) {
		if(document.getElementById) {
				document.getElementById(id).src = imgOver_sub[id].src;
		}
	}
	function out_sub(id) {
		if(document.getElementById) {
				document.getElementById(id).src = imgOut_sub[id].src;
		}
	}