if(document.images) {

pc_nav_home_on = new Image;
pc_nav_home_off = new Image;
pc_nav_review_on = new Image;
pc_nav_review_off = new Image;
pc_nav_books_on = new Image;
pc_nav_books_off = new Image;
pc_nav_about_on = new Image;
pc_nav_about_off = new Image;
pc_nav_register_on = new Image;
pc_nav_register_off = new Image;
pc_nav_logout_on = new Image;
pc_nav_logout_off = new Image;

pc_nav_manage_reviews_on = new Image;
pc_nav_manage_reviews_off = new Image;
pc_nav_manage_comment_on = new Image;
pc_nav_manage_comment_off = new Image;
pc_nav_manage_users_on = new Image;
pc_nav_manage_users_off = new Image;
 
pc_nav_home_on.src = "../img/pc_nav_home_on.gif";
pc_nav_home_off.src = "../img/pc_nav_home_off.gif";
pc_nav_review_on.src = "../img/pc_nav_review_on.gif";
pc_nav_review_off.src = "../img/pc_nav_review_off.gif";
pc_nav_books_on.src = "../img/pc_nav_books_on.gif";
pc_nav_books_off.src = "../img/pc_nav_books_off.gif";
pc_nav_about_on.src = "../img/pc_nav_about_on.gif";
pc_nav_about_off.src = "../img/pc_nav_about_off.gif";
pc_nav_register_on.src = "../img/pc_nav_register_on.gif";
pc_nav_register_off.src = "../img/pc_nav_register_off.gif";
pc_nav_logout_on.src = "../img/pc_nav_logout_on.gif";
pc_nav_logout_off.src = "../img/pc_nav_logout_off.gif";

pc_nav_manage_reviews_on.src = "../img/pc_nav_manage_reviews_on.gif";
pc_nav_manage_reviews_off.src = "../img/pc_nav_manage_reviews_off.gif";
pc_nav_manage_comment_on.src = "../img/pc_nav_manage_comment_on.gif";
pc_nav_manage_comment_off.src = "../img/pc_nav_manage_comment_off.gif";
pc_nav_manage_users_on.src = "../img/pc_nav_manage_users_on.gif";
pc_nav_manage_users_off.src = "../img/pc_nav_manage_users_off.gif";
}

function swapImage(f,n) {
  f = "document."+f;
  f = eval(f);
  n = eval(n);
  f.src = n.src;
}

/***********************************************
* Textarea Maxlength script- © Dynamic Drive (www.dynamicdrive.com)
* This notice must stay intact for legal use.
* Visit http://www.dynamicdrive.com/ for full source code
***********************************************/

function ismaxlength(obj){
  var mlength=obj.getAttribute? parseInt(obj.getAttribute("maxlength")) : "";
  if (obj.getAttribute && obj.value.length>mlength) {
    obj.value=obj.value.substring(0,mlength);
    alert("Sorry, you've gone over our 2000 character limit. Please can you shorten your review.");
  }
}