Javascript Select Dropdown Box (Defaults To Last Option Selected)

// Language: Javascript within ASP (Vbscript)
// Title: Javascript Select Dropdown Box (Defaults To Last Option Selected)
// Description: This javascript creates and writes out an HTML <select> dropdown box that defaults to the last option parameter passed to page
// Author: Karl Horky
// Creation Date: 27 October 2009
// Last Modified Date: 27 October 2009
 
var WindowLocation = window.location.href;
var OptionURLString = WindowLocation.substring(WindowLocation.indexOf('option=') + 7);
var CurrentOption = OptionURLString.substring(0,OptionURLString.indexOf('&')>=0?OptionURLString.indexOf('&'):OptionURLString.length);
var Options = {
  "opt1": { "fullname": "Option 1", "selected": (CurrentOption=="opt1" ? " selected=\"selected\"":"") },
  "opt2": { "fullname": "Option 2", "selected": (CurrentOption=="opt2" ? " selected=\"selected\"":"") },
  "opt3": { "fullname": "Option 3", "selected": (CurrentOption=="opt3" ? " selected=\"selected\"":"") },
  "opt4": { "fullname": "Option 4", "selected": (CurrentOption=="opt4" ? " selected=\"selected\"":"") },
  "opt5": { "fullname": "Option 5", "selected": (CurrentOption=="opt5" ? " selected=\"selected\"":"") },
  "opt6": { "fullname": "Option 6", "selected": (CurrentOption=="opt6" ? " selected=\"selected\"":"") }
};
var OptionSelect = "<select name=\"option\">";
for (Option in Options) {
  var OptionHash = Options[Option];
  OptionSelect += "<option value=\"" + Option + "\"" + OptionHash["selected"] + ">" + OptionHash["fullname"] + "</option>";
}
OptionSelect += "</select><br />";
document.write(OptionSelect);