Back to Top link in footer or page

Currently I have the following custom css in place:

.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 10px;
    z-index:250;
}

Ok, I’ve been trying for the longest to get this code to work but I am having some issues:

add_filter('tc_colophon_right_block', 'my_imageandtop');
function my_imageandtop(){
	$img_url = get_stylesheet_directory_uri().'/imgs/hdfooterlogo.png'; //put your image in child-theme/imgs
	//$backtop =  sprintf('<div class="%1$s"><p class="pull-right"><a class="back-to-top" href="#">%2$s</a></p></div>', 'Back to Top');
	$width = '250px';
	$height = '79px';
	$img = '<a href="http://www.hunterdouglas.com/" target=_blank><img alt="logo" src="'.$img_url.'" width="'.$width.'" height="'.$height.'" class="pull-right"></a>';
	return '<div class="span4 right-image"> '.$img.' </div>';
	}

I have the following code working to place an image in the right block

add_filter('tc_colophon_right_block', 'my_imagetop');
function my_imagetop(){
	$img_url = get_stylesheet_directory_uri().'/imgs/hdfooterlogo.png'; //put your image in child-theme/imgs
	$width = '250px';
	$height = '79px';
	$img = '<a href="http://www.hunterdouglas.com/" target=_blank><img alt="logo" src="'.$img_url.'" width="'.$width.'" height="'.$height.'" class="pull-right"></a>';
	return '<div class="span4 right-image">'.$img.'</div>';
	}

Now I’m trying to if I can have the back to top link and the image be in the same right block. When I try to do it the image overrites the back to top link. Here is the link that I want to add:

sprintf('<div class="%1$s"><p class="pull-right"><a href="#">%2$s</a></p></div>)

I see in the function.php for the base theme that there is a function for the back-to-top. I’ve been trying to use the html in there to get it to show up in this custom function but I’m not having any luck