function preload_img() {
	img1 = new Image();
	img1.src = "/english/images/bt_home_o.gif";
	img2 = new Image();
	img2.src = "/english/images/bt_newsrelease_o.gif";
	img3 = new Image();
	img3.src = "/english/images/bt_topmessage_o.gif";
	img4 = new Image();
	img4.src = "/english/images/bt_philosophy_o.gif";
	img5 = new Image();
	img5.src = "/english/images/bt_profile_o.gif";
	img6 = new Image();
	img6.src = "/english/images/bt_profile02_01_o.gif";
	img7 = new Image();
	img7.src = "/english/images/bt_profile02_02_o.gif";
	img8 = new Image();
	img8.src = "/english/images/bt_profile02_03_o.gif";
	img9 = new Image();
	img9.src = "/english/images/bt_profile02_04_o.gif";
	img10 = new Image();
	img10.src = "/english/images/bt_profile02_05_o.gif";
	img11 = new Image();
	img11.src = "/english/images/bt_formation_o.gif";
	img12 = new Image();
	img12.src = "/english/images/bt_field_o.gif";
	img13 = new Image();
	img13.src = "/english/images/bt_field02_01_o.gif";
	img14 = new Image();
	img14.src = "/english/images/bt_field02_02_o.gif";
	img15 = new Image();
	img15.src = "/english/images/bt_field02_03_o.gif";
	img16 = new Image();
	img16.src = "/english/images/bt_field02_04_o.gif";
	img17 = new Image();
	img17.src = "/english/images/bt_field02_05_o.gif";
	img18 = new Image();
	img18.src = "/english/images/bt_field02_06_o.gif";
	img19 = new Image();
	img19.src = "/english/images/bt_media_o.gif";
	img20 = new Image();
	img20.src = "/english/images/bt_vision_o.gif";
}