top_buttom1on=new Image();	top_buttom1on.src="images/top_buttom1_on.gif";
top_buttom2on=new Image();	top_buttom2on.src="images/top_buttom2_on.gif";

top_buttom1off=new Image();	top_buttom1off.src="images/top_buttom1_off.gif";
top_buttom2off=new Image();	top_buttom2off.src="images/top_buttom2_off.gif";

menu1on=new Image();	menu1on.src="images/menu_01_on.gif";
menu2on=new Image();	menu2on.src="images/menu_02_on.gif";
menu3on=new Image();	menu3on.src="images/menu_03_on.gif";
menu4on=new Image();	menu4on.src="images/menu_04_on.gif";
menu5on=new Image();	menu5on.src="images/menu_05_on.gif";
menu6on=new Image();	menu6on.src="images/menu_06_on.gif";
menu7on=new Image();	menu7on.src="images/menu_07_on.gif";

menu1off=new Image();	menu1off.src="images/menu_01_off.gif";
menu2off=new Image();	menu2off.src="images/menu_02_off.gif";
menu3off=new Image();	menu3off.src="images/menu_03_off.gif";
menu4off=new Image();	menu4off.src="images/menu_04_off.gif";
menu5off=new Image();	menu5off.src="images/menu_05_off.gif";
menu6off=new Image();	menu6off.src="images/menu_06_off.gif";
menu7off=new Image();	menu7off.src="images/menu_07_off.gif";


function menu_on(imgName){
document[imgName].src=eval(imgName+"on.src");
}
function menu_off(imgName){
document[imgName].src=eval(imgName+"off.src");
}