获取hashchange事件以适用于所有浏览器（包括IE7）

I have some code (written by another developer) that is doing AJAX page loading inside of WordPress (e.g. no page reloads) when you click a nav item, AJAX refreshes the primary content area. My problem is that it's broken in IE7 and I have no idea where to start in terms of debugging.I have some code (written by another developer)