Added help for 'usecookies' option.

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/trunk/unstable@547 b72ed6b6-b9f8-46b5-92b4-906544132732

admin/lang/english/admin.html

@@ -86,7 +86,20 @@
 time/date entry to every response so you can keep a record with each 
 participants response of when they completed the survey. The <b>Expiry Date</b>: 
 is the date at which your survey will cease to be publicly available. If you 
-leave this field blank, the survey will never expire.</font></p>
+leave this field blank, the survey will never expire. </font></p>
+<p><font face="Verdana" style="font-size: 8pt">The option <b>Use Cookies?</b> 
+allows you to set some basic access controls over your survey if you are not 
+using tokens. Setting this to 'Y' means that when a participant successfully 
+submits their survey responses, a cookie is saved to their computer indicating 
+that they have done so. The next time they attempt to complete the survey using 
+the same computer they will not be able to do so. It should be noted that this 
+is fairly basic, and not particularly clever access control. If two different 
+people want to complete the survey using the same computer, this method will 
+preclude them from doing so - only the first will be able to. If one person 
+tries to complete the survey twice, but on different computers, they will be 
+able to do so. So you should be aware of these issues before applying this 
+option. It is helpful to provide some impediments to multiple responses by the 
+same person but certainly not a foolproof solution.</font></p>
 <p><font face="Verdana" style="font-size: 8pt"><b>Importing a Survey</b><br>
 You can use the file menu at the bottom of the screen to import a survey. Click 
 on browse, choose the PHPSurveyor *.sql file containing your survey and then