unterminated string literal

i am getting an error of: unterminated string literal in a popup and cannot see where the error is. i have posted the code and would be grateful if someone could tell me how to troubleshoot this. it is only happening with 1 user as all the other users can action ok. many thanks
<td valign=\"top\"><a href=\"#\" onClick=\"PopUp('" . $action . "','winAvail','status=no,scrollbars=no,resizable=no,width=465,height=450');\">Action</a></td>


<script language="JavaScript" type="text/JavaScript"> 

function PopUp(theURL,winName,features) {
 var oWin = window.open(theURL,winName,features);

action var

$action = "action.php?id=$id&slot=$slot&service=$service&company=$company&user=$custname&department=$department&activity=$activity&item=$item&filebox=$filebox&date=$date&quantity=$quantity&type=$type&new=$new";

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You probably have single quotes in the data somewhere
$action = str_replace("'", "''", "action.php?id=$id&slot=$slot&service=$service&company=$company&user=$custname&department=$department&activity=$activity&item=$item&filebox=$filebox&date=$date&quantity=$quantity&type=$type&new=$new");

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Does the 1 user have their javascript disabled? Also... post the full error message they get.
Try again
$action = str_replace("'", "\\'", "action.php?id=$id&slot=$slot&service=$service&company=$company&user=$custname&department=$department&activity=$activity&item=$item&filebox=$filebox&date=$date&quantity=$quantity&type=$type&new=$new");

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peter_coopAuthor Commented:
still the same. i have pulled the response html from firebug and can only think that there is a space in the user field?
<a onclick="PopUp('action.php?id=4087&amp;slot=&amp;service=Standard&amp;company=8&amp;user=David 
Brown&amp;department=84&amp;activity=Box Retrival&amp;item=CEN11706&amp;filebox=Only used with files&amp;date=12-08-2010 13:12:53&amp;quantity=0&amp;type=0&amp;new=1','winAvail','status=no,scrollbars=no,resizable=no,width=465,height=450');" href="#">Action</a>

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Right here:

date=12-08-2010 13:12:53&amp;

and also in filebox=Only used with files

Lastly there shouldn't be a return between Dan and Brown...

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peter_coopAuthor Commented:
thank you very much
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