php ajax login system

can u give me example of login script using php, mysql and ajax.

i am using sha1, but i don't know how to use salt. if possible can u explain me how do add salt and match it with password in db, but it is secondary ... main thing i wanna know is ajax login .. thanks loads :)
nandananushil1Asked:
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Ludwig DiehlConnect With a Mentor Systems ArchitectCommented:
Here I have made an example for u. It is very simple however it achieves what u want. About salting, let me give an example later.. cheers
php-ajax-login-system.zip
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Ludwig DiehlSystems ArchitectCommented:
ohh I forgot to attach th db dump file.
db-login.zip
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Ludwig DiehlSystems ArchitectCommented:
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Ludwig DiehlSystems ArchitectCommented:
base on the link I sent...
I have modified it in order to make it a little bit stronger...You can try to get it even stronger. I suggest u use as a salt, the username for instance..or some whatever u want.
function generateHash($sPlainText,$sSalt)
{    
    $aPlainText     = str_split($sPlainText);
    $sPlainText     = '';
    foreach($aPlainText as $sChar)
    {
        $sPlainText.= $sSalt.$sChar;                     
    }
    $sPlainText=sha1($sPlainText);
    return $sPlainText;
}

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