function iconinsert(){   
  $(".newsCalendar_listBody:eq(0) a").css("background", "url('fileadmin/template/newscalendar/images/schwimmen.png') no-repeat ");
  $(".newsCalendar_listBody:eq(1) a").css("background", "url('fileadmin/template/newscalendar/images/wasserball.png') no-repeat ");
  $(".newsCalendar_listBody:eq(2) a").css("background", "url('fileadmin/template/newscalendar/images/strand.png') no-repeat ");

}  

$(document).ready(function() {
  iconinsert();  
});