utils.js

function $(e) { return document.getElementById(e); }

function setcookie(name,value,expiredays) {
    var d = new Date();
    d.setTime(d.getTime()+(expiredays*24*60*60*1000));
    var expires = "expires="+d.toGMTString();
    document.cookie = name + "=" + value + "; " + expires;
}

function getcookie(name) {
    var n = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0; i < ca.length; i++) {
	var c = ca[i].trim();
	if (c.indexOf(name)==0) return c.substring(n.length,c.length);
    }
    return "";
}

function erasecookie(name) {
    setcookie(name,"",-1);
}


Array.prototype.unique = function(){
   var u = {}, a = [];
   for(var i = 0, l = this.length; i < l; ++i){
      if(u.hasOwnProperty(this[i])) {
         continue;
      }
      a.push(this[i]);
      u[this[i]] = 1;
   }
   return a;
}