Topic awaiting preservation: JavaScript search/replace query string (Page 1 of 1)

I have a URL which looks something like this ...
http://xx.xx.xxx.xx/olgc/contacts.asp?action=&opt=&orderby=Promo&page=3

and, what I'd like to do, is be able to replace the orderby=Promo with various things, such as last_name/etc, and re-load the page. Currently, what I have is at the top of the table, is headers with things like <a href="Javascript:reorder('Last_Name');>

and the functions..

function getOrder(pair)

{

	var temp = pair.split("=")

	return temp[0];

}

function changeorder(neworder)

{

	var httpArray = window.location.toString().split('&');

	for(x=0;x<httpArray.length;x++)	{

		if(getOrder(httpArray[x]) == 'orderby')

			httpArray[x] = "orderby=" + neworder;



	}

	

	window.location.replace(httpArray.join("&"));

	

}

This works, however.. I have a nagging feeling this isnt the best way of going about it. I have re-written it once (first version managed to be 2x as long for some reason...), but still think it 'could be better'. Not sure why I'm so focused on a trivial little piece of code, I guess its just me not wanting to read 60 pages of stats homework

<script>
str = window.location.toString();
alert(str.replace(/orderby=[^&]*(&

Thanks.

I allways have this nagging feeling that I *should* take it upon myself to learn regex expressions. But, they allways scare me