function switch_pic(i){    
	var main_pic = document.pic0.src;
	var main_pic_dir = main_pic.substring(0,main_pic.lastIndexOf("/",main_pic.length)+1);
	main_pic = main_pic.substring(main_pic.lastIndexOf("/",main_pic.length)+1);
		var small_pic = eval ('document.pic'+i+'.src');
	var small_pic_dir = small_pic.substring(0,small_pic.lastIndexOf("/",small_pic.length)+1);
	small_pic = small_pic.substring(small_pic.lastIndexOf("/",small_pic.length)+1);

	document.pic0.src = main_pic_dir+small_pic;
	//eval ('document.pic'+i+'.src = small_pic_dir+main_pic')
}