if (bCheckLowerCase)
    {
        strCheck = "abcdefghijklmnopqrstuvwxyz";
        if (doesContain(strPassword, strCheck) > 0) 
        { 
                nCombinations += strCheck.length; 
            }
    }

to 
 Code:
if (bCheckLowerCase)
    {
        strCheck = "a";
        if (doesContain(strPassword, strCheck) > 0) 
        { 
                nCombinations += strCheck.length; 
            }
    }

then also if i enter "abcde" the thing works..ie it then  also works for all lowercase alphabets.. how does it do so..

also what  does this part of code do..
 Code:
// -- 500 tries per second => minutes 
        var nDays = ((Math.pow(nCombinations, strPassword.length) / 500) / 2) / 86400;
 
    // Number of days out of password lifetime setting
    var nPerc = nDays / nPasswordLifetime;
    
    return nPerc;