function change_img()
{
document.images.im1.src = "images/menu_01.png";
document.images.im2.src = "images/menu_02.png";
}
function change_back()
{
document.images.im1.src = "images/menu_01.png";
document.images.im2.src = "images/menu_02.png";
}
function change_img1(){
document.images.im1.src = "images/menu1_01.png";
document.images.im2.src = "images/menu1_02.png";
document.images.im3.src = "images/menu1_03.png";
}
function change_back1(){
document.images.im1.src = "images/menu_01.png";
document.images.im2.src = "images/menu_02.png";
document.images.im3.src = "images/menu_03.png";
}
function change_img2(){
 document.images.im1.src = "images/menu1_01.png";
document.images.im2.src = "images/menu4_02.png";
document.images.im3.src = "images/menu2_03.png";
document.images.im4.src = "images/menu2_04.png";
}
function change_back2(){
document.images.im1.src = "images/menu_01.png";
document.images.im2.src = "images/menu_02.png";
document.images.im3.src = "images/menu_03.png";
document.images.im4.src = "images/menu_04.png";
}
function change_img3(){
document.images.im1.src = "images/menu1_01.png";
document.images.im2.src = "images/menu4_02.png";
document.images.im4.src = "images/menu3_04.png";
document.images.im5.src = "images/menu3_05.png";
}
function change_back3(){
	document.images.im1.src = "images/menu_01.png";
	document.images.im2.src = "images/menu_02.png";
document.images.im4.src = "images/menu_04.png";
document.images.im5.src = "images/menu_05.png";
}
function change_img4(){
	document.images.im1.src = "images/menu1_01.png";
	document.images.im2.src = "images/menu4_02.png";
document.images.im5.src = "images/menu4_05.png";
document.images.im6.src = "images/menu4_06.png";
}
function change_back4(){
document.images.im1.src = "images/menu_01.png";
document.images.im2.src = "images/menu_02.png";
document.images.im5.src = "images/menu_05.png";
document.images.im6.src = "images/menu_06.png";
}