function butt_on(bname){
but = eval(bname + "_1");
document [bname].src = but.src;
}

function butt_off(bname){
but = eval(bname + "_0");
document [bname].src = but.src;
}
	
function SetArrowOn(arrow_name){
	document [arrow_name].src = "_library_img/left_menu_arrow_1.jpg";
}

function SetArrowOff(arrow_name){
	document [arrow_name].src = "_library_img/left_menu_arrow_0.jpg";
}

b1_0 = new Image(); b1_0.src = "_library_img/_011_bt_home_0.jpg";
b1_1 = new Image(); b1_1.src = "_library_img/_011_bt_home_1.jpg";
b2_0 = new Image(); b2_0.src = "_library_img/_012_bt_presentation_0.jpg";
b2_1 = new Image(); b2_1.src = "_library_img/_012_bt_presentation_1.jpg";
b3_0 = new Image(); b3_0.src = "_library_img/_013_bt_program_0.jpg";
b3_1 = new Image(); b3_1.src = "_library_img/_013_bt_program_1.jpg";
b4_0 = new Image(); b4_0.src = "_library_img/_014_bt_racing_0.jpg";
b4_1 = new Image(); b4_1.src = "_library_img/_014_bt_racing_1.jpg";
b5_0 = new Image(); b5_0.src = "_library_img/_015_bt_news_0.jpg";
b5_1 = new Image(); b5_1.src = "_library_img/_015_bt_news_1.jpg";
b6_0 = new Image(); b6_0.src = "_library_img/_016_bt_team_0.jpg";
b6_1 = new Image(); b6_1.src = "_library_img/_016_bt_team_1.jpg";
b7_0 = new Image(); b7_0.src = "_library_img/_017_bt_partners_0.jpg";
b7_1 = new Image(); b7_1.src = "_library_img/_017_bt_partners_1.jpg";
b8_0 = new Image(); b8_0.src = "_library_img/_018_bt_gallery_0.jpg";
b8_1 = new Image(); b8_1.src = "_library_img/_018_bt_gallery_1.jpg";
b9_0 = new Image(); b9_0.src = "_library_img/_019_bt_contact_0.jpg";
b9_1 = new Image(); b9_1.src = "_library_img/_019_bt_contact_1.jpg";

b10_0 = new Image(); b10_0.src = "_library_img/bt_email_0.jpg";
b10_1 = new Image(); b10_1.src = "_library_img/bt_email_1.jpg";
b11_0 = new Image(); b11_0.src = "_library_img/bt_print_0.jpg";
b11_1 = new Image(); b11_1.src = "_library_img/bt_print_1.jpg";
b12_0 = new Image(); b12_0.src = "_library_img/bt_site_map_0.jpg";
b12_1 = new Image(); b12_1.src = "_library_img/bt_site_map_1.jpg";