$(function() {

    var $el, leftPos, newWidth;
    
    $("#gNavi").append("<li id='magic-line'></li>");
    
    var $magicLine = $("#magic-line");
    
    $magicLine
        .width($(".current_page_item").width())
        .css("left", $(".current_page_item a").position().left)
        .data("origLeft", $magicLine.position().left)
        .data("origWidth", $magicLine.width());
        
    $("#gNavi li").find("a").hover(function() {
        $el = $(this);
        var cl = $(this).parent('li').attr('class');
        if (cl != 'current_page_item'){
        	$el.find('img').fadeTo(10,0);
        }
        leftPos = $el.position().left;
        newWidth = $el.parent().width();
        
        $magicLine.stop().animate({
            left: leftPos,
            width: newWidth
        });
    }, function() {
    	var cl = $(this).parent('li').attr('class');
        if (cl != 'current_page_item'){
    		$el.find('img').fadeTo(10,1);
    	}
        $magicLine.stop().animate({
            left: $magicLine.data("origLeft"),
            width: $magicLine.data("origWidth")
        });    
    });
});