var old_menu='';
var Max_MenuNum ;
function menuclick(idx)
{
		Max_MenuNum = img_arr.length;
		var submenu ;
		var cellbar ;
		eval("submenu = submenu" + idx );
		eval("cellbar = bar"+idx );
			
		// view content
		if(old_menu != ''){
			old_menu.style.display="none";
		}
		submenu.style.display="";
		old_menu=submenu;
		// switch bar
		for (i=0; i< Max_MenuNum; i++){
			if (i==idx)  eval("bar"+i+".src = 'http://image.ahnlab.com/info/productinfo/menu_"+img_arr[i]+"_on.gif'");
				else eval("bar"+i+".src = 'http://image.ahnlab.com/info/productinfo/menu_"+img_arr[i]+".gif'");
		}
}