parent.frames["nav_frame"].img_two_def.src = parent.frames["nav_frame"].img_two_chk.src;
	parent.frames["nav_frame"].document.images.img_two.src = parent.frames["nav_frame"].img_two_def.src;
	
	parent.frames["nav_frame"].document.images.img_one.src = parent.frames["nav_frame"].img_one_off.src;
	parent.frames["nav_frame"].document.images.img_three.src = parent.frames["nav_frame"].img_three_off.src;
	parent.frames["nav_frame"].document.images.img_four.src = parent.frames["nav_frame"].img_four_off.src;
	parent.frames["nav_frame"].img_one_def.src = parent.frames["nav_frame"].img_one_off.src;
	parent.frames["nav_frame"].img_three_def.src = parent.frames["nav_frame"].img_three_off.src;
	parent.frames["nav_frame"].img_four_def.src = parent.frames["nav_frame"].img_four_off.src;