If you want to place floated content to center you should:

• wrap floated elements;
• count the the "new width" = sum of widths of children elements;
• set the width of the wraped parent element as the "new width";

HTML:

<div class="to_center">
	<div class="floated">floated text</div>
	<div class="floated">floated text</div>
	<div class="floated">floated text</div>
</div>

CSS:

.to_center {
margin-left:auto; 
margin-right:auto;
}
.floated {
float:left;
}

jQuery code:

jQuery(function($){
	$('.to_center').each(function(){
		var new_width = 0;
		$(this).children('.floated').each(function(){
			new_width += $(this).width();
		});
		$(this).width(new_width);
	});
});

Note: The sum of widths of your children elements should not exceed the width of the global wrapper or, in the other words, children elements should fit in one line.