[pristav2]

Решение проблемы (может кому пригодится) :

var my_top_photo_flag = true;
         	$(document).ready(function(){
			$(".top-menu a").click(function(){	
				var link_href = $(this).attr("href");		
				if (link_href) {
					
					$(".page_content").load(link_href + "?only_content=1");
					
					var image_path = "<?=BX_PERSONAL_ROOT?>" + "/templates/youarex/images/" + link_href.replace(/\//g, "") + ".png";
					var image = new Image();
					$(image).load(function () {
						var my_top_photo_1 = my_top_photo_flag ? $("#my_top_photo_img1") : $("#my_top_photo_img2"); // Текущий
						var my_top_photo_2 = my_top_photo_flag ? $("#my_top_photo_img2") : $("#my_top_photo_img1"); // Не активный
						
						my_top_photo_2.css("left", -650).attr("src", image_path).animate({ left: 0 }, 500);
						my_top_photo_1.animate({ left: 650 }, 500);

my_top_photo_flag = !my_top_photo_flag;
					}).attr("src", image_path);
					
					return false;
				}
			});
		});