String.getParam()

function gup( name )
{
  name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
  var regexS = "[\\?&]"+name+"=([^&#]*)";
  var regex = new RegExp( regexS );
  var results = regex.exec( window.location.href );
  if( results == null )
    return "";
  else
    return results[1];
}
 
String.prototype.getParam = function(param) {
 
	//check if url follows [http://domain.tld?parameter=value] schema
	var url = new RegExp(/(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?[\\?&]\w=(.*)?/);
	if (url.test(this)) {
 
		//check if explicit parameter is sought after 
		if (!param) {
			var qs = this.split("?")[1];
			this.param = qs.split("=")[0];
			param = this.param;
		}
 
		//if it is, clean it
		param = param.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
 
		//pull value from parameter
		var regexS = "[\\?&]"+param+"=([^&#]*)";
		var regex = new RegExp( regexS );
		var results = regex.exec( this );
		return results[1];
 
	} else {
 
		return false;
 
	}
 
}
 
alert( "http://google.com?moo=cow".getParam() );