JavaScript: Get QueryString URL Parameter value

querystring.js

function getURLParameter(name,usePoundInsteadOfQuestionMarkIfAvailable) {
  var url = window.location.href;

  // use #param=value method?
  if(url.indexOf('?',0) == -1) usePoundInsteadOfQuestionMarkIfAvailable = true;
  var poundExistsInURL = (url.indexOf('#',0) > -1);
  if(
      (usePoundInsteadOfQuestionMarkIfAvailable == true) &&
      (poundExistsInURL)){
    return getHashParams()[name];
  }

  // otherwise use ?param=value method
  name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
  var regexS = "[\\?&]"+name+"=([^&#]*)";
  var regex = new RegExp( regexS );
  var results = regex.exec( url );
  if( results == null )
    return "";
  else
    return results[1];
}