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)); 
  }