jQuery.fn.center = function () {
  this.css("position","absolute");
  this.css("top", ( $(window).height() - this.height() ) / 2+$(window).scrollTop() + "px");
  this.css("left", ( $(window).width() - this.width() ) / 2+$(window).scrollLeft() + "px");
  return this;
}


function displayhelp(inTitle, inText) {

  var objTitle = $(inTitle);
  var objText = $(inText);
  var objReplace = $("<div id=\"div_helpContent\"><h3>" + inTitle + "</h3><p>" + inText + "</p></div>");


  $("#div_helpContent").replaceWith(objReplace)
  $("#div_helpWindow").css( "display", "block" );
  $("#div_helpWindow").center();

}

//<div id=\"div_helpTitle\"><img src=\"closehelp.png\" class=\"closeHelp\" alt=\"Close\" /></div>


$(document).ready(
  function() {

    $("body").append(
      "<div id=\"div_helpWindow\"><div id=\"div_helpContent\"><h3>Titel</h3><p>Text</p></div><div id=\"div_helpBottom\"><input type=\"button\" value=\"Schließen\" class=\"button closeHelp\" /></div></div>" );

    $("#div_helpWindow").css( "display", "none" );
    $("#div_helpWindow").center();
    $("#div_helpWindow").find(".closeHelp").css( "cursor", "pointer" );
    $("#div_helpWindow").find(".closeHelp").click(
      function() {
        $("#div_helpWindow").css( "display", "none" );
      });

  });