Add or Subtract items to a string & Updates

				
'**************************************
' Name: Add or Subtract items to a string & Updates
' Description:Send two parameters to this function and it will maintain a running total.
' By: Jonathan Astie
'
' Inputs:Acction = "Add" or "Subtract"
String you want to add or subtract
'
' Returns:Maintains var String in comma delimited format
'
'This code is copyrighted and has' limited warranties.Please see http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=1758&lngWId=14'for details.'**************************************

<script language="javascript"><!--
var String = "";
function updateString (action, id)
{
if (action = remove)
{
var start = String.indexOf(id);
if (String.length==(start + id.length)) 
	{
String = String.substring(0, start);
}
if (start==0) 
	{
String = String.substring(id.length + 1, String.length);
}
 	else
{
var end_id = start + id.length;
var tmp = String.substring(0, start);
var tmp2 = String.substring(end_id + 1, shopping_cart.length);
String = tmp + tmp2; 
}
	}
	else
{
String += id + ",";
}
}
// -->
</script>