PHP include problem

[jflowers]

Hello, i've been working with ajax for a few weeks now and i have a simple question. I want to keep this somewhat simple but tell me if i need to give more.

I have an ajax method that is being called, lets say....
function listClient(str)
{
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
{
alert ("Browser does not support HTTP Request")
return
}
var url="/lib/clients.php"
url=url+"?q="+str
url=url+"&sid="+Math.random()
xmlHttp.onreadystatechange=generateHTML
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}
When it opens up /lib/clients.php and runs everything works fine and dandy.

Athough as my script has progressed in complexity, i turns out i need to add an include file in that clients.php

whenever i add the include file ---- require_once('file.php'); The script stops working. Let me be more clear the clients.php script still works, but the ajax doesn't.

(The Entire process is this... going from html and using Jquery to tell if someone clicked something.. jquery called the ajaxs method and that opens up the connection to the php script. PHP runs and then generates xml in which ajax/jquery reads and then sends back to html. Again the entire process works if i don't add that include (the include file is only one line right now) so i think its something wrong with ajax getting confused)

Please help

[jflowers]

any help at all would be wonderfull