Parsing a querystring [Resolved]

[mendhak]

I have a page, which will be called like so:

pagename.html?Referrer=PI

I need to use javascript to parse the querystring, and I simply need to check whether

Referrer = PP
Referrer = PI
or referrer simply isn't there.

This is the code I have, but it doesn't work.

<script language="javascript">

function querystring(key){ 
var value = null; 
for (var i=0;i<querystring.keys.length;i++) 
{ 
if (querystring.keys[i]==key) 
{ 
value = querystring.values[i]; 
break; 
} 
} 
return value; 
} 

querystring.keys = new Array(); 
querystring.values = new Array(); 

function querystring_parse() 
{ 
var query = window.location.search.substring(1); 
var pairs = query.split("&"); 

for (var i=0;i<pairs.length;i++) 
{ 
var pos = pairs[i].indexOf('='); 
if (pos >= 0) 
{ 
var argname = pairs[i].substring(0,pos); 
var value = pairs[i].substring(pos+1); 
querystring.keys[querystring.keys.length] = argname; 
querystring.values[querystring.values.length] = value; 
} 
} 
} 

querystring_parse(); 

x = querystring("Referrer"); 

//This is my main function, "goback", I'm trying to work with x

function goback(){
if x=="PP"{
document.location.href='page1.html';
}
else if x=="PI"{
document.location.href=page2.html';
}
else{
document.location.href=page3.html';
}
}



	</script>

I am calling it like this:

<img src="brain.gif" onClick="javascript:goback();">

I'd appreciate any help.

Edit: When I say "it doesn't work", it means I'm getting an error, "Object expected". That doesn't give me an idea as to what the problem is.