The ajaxphp user does not need to log on to the instance.

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5. Ajax php users do not need to log on to the instance 
6. Script
7. Function userlogin (){
8. Var xmlhttp;
9. Var str;
10. Var sendstr = "";
11. Try {
12. Xmlhttp = new xmlhttprequest ();
13. }
14. Catch (e ){
15. Xmlhttp = new activexobject ("microsoft. xmlhttp ");
16. }
17. Xmlhttp. onreadystatechange = function (){
18. If (xmlhttp. readystate = 4 ){
19. If (xmlhttp. status = 200 ){
20. Str = xmlhttp. responsetext;
21. Document. getelementbyid ("userlogin"). innerhtml = str;
22. } Else {
23. Alert ("system error. if you have any questions, please contact the administrator! "+ Xmlhttp. status );
24. }
25. }
26. }
27. Xmlhttp. open ("post", "config/userlogin. php", true );
28. Xmlhttp. setrequestheader ('content-type', 'application/x-www-form-urlencoded ');
29. Xmlhttp. send (sendstr );
30. }
31. Script
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Userlogin. php file

2. $ Uid = $ _ post ['uname'];
3. $ Pwd = $ _ post ['upwd '];
4. $ SQL = "select * from tabname where uid = '$ uid' and pwd =' $ pwd '";
5. $ Query = mysql_query ($ SQL );
6. If (mysql_num_rows ($ query ))
7. {
8. Echo 'logon successful ';
9. }
10. Else
11. {
12. Echo 'The user name or password is incorrect! ';
13. }
14. ?>