Объединение двух js скриптов в один

var h1 = $("#header-1");
var h2 = $("#header-2");

<script>
$.fn.posfixstat = function() {
    var $this = $(this);
    var a = $this.offset().top;
    $(window).scroll(function(){
        var w = $(window).scrollTop();
        if ( w > a ) $this.css({position:"fixed",top:"-2px"});
        else $this.css({position: "static"});
    });
};
$(function(){
    $("#header-1").posfixstat();
    $("#header-2").posfixstat();
})
</script>

$.fn.posfixstat = function() {
    var $this = $(this);
    var a = $this.offset().top;
    var o = ($this.data('top')) ? $this.data('top') : 0;
    $(window).scroll(function(){
        var w = $(window).scrollTop();
        if ( w > a ) $this.css({position:"fixed",top:o+"px"});
        else $this.css({position: "static"});
    });
};
$(function(){
    $("#header-1, #header-1").posfixstat();
});

<div id="header-1" data-top="-2"></div>
<div id="header-2" data-top="-5"></div>