Back Button

A jquery back button:

jQuery(document).ready(function($){
    $('button.back').click(function(){
        parent.history.back();
        return false;
    });
});

jQuery(document).ready(function($){

$('button.back').click(function(){

parent.history.back();

return false;

});

Your html would be:

<button class="back">Back</button>

Plus whatever css you want to use to style the button.