search attribute in left side filter_attribute.phtml

<script>
jQuery(".attr_filter_input").keyup(function(){
        this_input = jQuery(this);
        this_input.parents("ol").find("li").each(function(){
            this_li = jQuery(this);
            if(this_li.index() != 0)    {
                this_input_value = this_input.val().toLowerCase();
                this_li_label_text = this_li.find("label").text().toLowerCase();
                if(this_li_label_text.indexOf(this_input_value) < 0)
                    this_li.hide();
                else
                    this_li.show();
            }
        });
});
</script>