var screenWidth = $(window).width();
var screenHeight = $(window).height(); //当前浏览器窗口的 宽高
var scrolltop = $(document).scrollTop();//获取当前窗口距离页面顶部高度
var objLeft = (screenWidth - 2)/2.5 ;   //2 可以根据需要修改
var objTop = (screenHeight - 100)/2 + scrolltop;  //100可以根据需要修改
var popupHeight = $(".resourceSharePopup").outerHeight(true);
$(".resourceSharePopup").css("marginTop",-popupHeight/2);

$("#upload_box").css('left',objLeft).css('top',objTop);
$("#upload_box").html('<%= escape_javascript( render :partial => "resource_share_popup" ,:locals => {:courses=>@course,:user=>@user})%>');
$("#upload_box").css('display','block');