jQuery scrollTop malfunction

[ManuelVRC]

Hi everyone...

I'm developing a website for my customer and I've implemented jQuery with a simple script:

var fixed = false;

$(window).scroll(function() {
	 if( $(window).scrollTop() + $(window).height() == $(document).height()) {
        if( !fixed ) {
            fixed = true;
            $('.return').fadeIn("slow");
        }                                           
    } else {
        if( fixed ) {
            fixed = false;
            $('.return').fadeOut("slow");
        }
    }
});

Where is the problem?
Well in the homepage all is ok no errors, when I scroll until the end of the page, the div with the link for return to top appears and when I scoll to top the div disappear.
In the second page I've implemented the same structure of the page, I've added only different text and a custom Google Maps with her API. What happens now? The script work on the contrary, when I scroll until the end of the page the div disappears and when I scroll to top this b***h appears.

What is the mistake?