função

Amigos, estou testando um script do e-Goi más esta função esta dando erro linha 13.

alguém pode ajudar?

<script>
 $(document).ready(function()
 {

/ Uploading Profile BackGround Image /

 $('body').on('change','#bgphotoimg', function()
 {
 $("#bgimageform").ajaxForm({target: '#timelineBackground',
 success:function(){
 $("#timelineShade").hide();
 $("#bgimageform").hide();
 }).submit();
 });

/ Banner position drag /

 $("body").on('mouseover','.headerimage',function()
 {
 var y1 = $('#timelineBackground').height();
 var y2 = $('.headerimage').height();
 $(this).draggable({
 scroll: false,
 axis: "y",
 drag: function(event, ui) {
if(ui.position.top >= 0)
 {
 ui.position.top = 0;
 }
else if(ui.position.top <= y1 - y2)
 {
 ui.position.top = y1 - y2;
 }
 },
 stop: function(event, ui)
 {
 }
 });
 });

/ Bannert Position Save/

 $("body").on('click','.bgSave',function ()
 {
 var p = $("#timelineBGload").attr("style");
 var Y =p.split("top:");
 var Z=Y[1].split(";");
 var dataString ='position='+Z[0];
 $.ajax({
 type: "POST",
 url: "image_saveBG_ajax.php",
 data: dataString,
 cache: false,
success: function(html)
 {
if(html)
 {
 $(".bgImage").fadeOut('slow');
 $(".bgSave").fadeOut('slow');
 $("#timelineShade").fadeIn("slow");
 $("#timelineBGload").removeClass("headerimage").css({'margin-top':html});
return false;
 }
 }
 });
return false;
 });

 });
</script>