$(document).ready(function () {
	$(document).mousemove(function(e){
		if(e.pageY < 75)
		{
			$("#headerWrap").css("z-index","100");
			$("#book").css("z-index","1");
		}
		if(e.pageY > 75)
		{
			$("#book").css("z-index","100");
			$("#headerWrap").css("z-index","1");
		}
   }); 
});