function PageQuery(q) {
   if(q.length > 1) this.q = q.substring(1, q.length);
   else this.q = null;
   this.keyValuePairs = new Array();
   if(q) {
      for(var i=0; i < this.q.split("&").length; i++) {
         this.keyValuePairs[i] = this.q.split("&")[i];
      }
   }
   this.getKeyValuePairs = function() { return this.keyValuePairs; }
   this.getValue = function(s) {
      for(var j=0; j < this.keyValuePairs.length; j++) {
         if(this.keyValuePairs[j].split("=")[0] == s)
         return this.keyValuePairs[j].split("=")[1];
      }
      return false;
   }

   this.getParameters = function() {
      var a = new Array(this.getLength());
      for(var j=0; j < this.keyValuePairs.length; j++) {
         a[j] = this.keyValuePairs[j].split("=")[0];
      }
      return a;
   }

   this.getLength = function() { return this.keyValuePairs.length; }
}

function queryString(key){
   var page = new PageQuery(window.location.search);
   return unescape(page.getValue(key));
}