function hideAll() {
  $("div[@id*=fieldInfo]").hide();  
}

function init() {

  hideAll();

  $("div[@id*=fieldInfo]").each(function(i) {
    var saveme = $(this);
    var id = this.id;
    var idNumber = id.substring(9);  // move past "fieldInfo"

    var divName = "#showField" + idNumber + " a";

    $(divName).click(function(event) {
      hideAll();
      saveme.toggle();
    }); 
  }); 
}

$(document).ready(init);