Yeah can be between 5-6 
Like 
1. Entering the URL in the address 
2. Enter valid user name and password (+ve test case)
3. Enter invalid user name and password (-ve test case)
4. Home is opened when logged in
5. Displays in the home page

hi ,
1.Enter valid user name and password (+ve test case) ,click 
ok button it displays next screen,
2. Enter invalid user name and password (-ve test case)it 
should display worning message
3.click on cancel button in login screen if has cancel 
button
4.if caps loc on it should display tootip caps' loc is on
5enter the user name ,with out enter password click on ok 
button display proper message
5.with out enter user name click tab or moves to password 
field it shoudl display enter user name
6 Tab order of login page

verify user name with valid inputs(+ve test case)
verify user id with invalid data(-ve testcase)
verify password with valid data (+ve testcase)
verify password with invalid data (-ve test case )
verify if the corresponnding window is opening or not after 
valid information given and press ok button

Verify login operation with valid data
Verify login operation with invalid data
verify login operation with out giving mandatary data
verify login operation  by clicking on cancel button

I agree with the above test cases. I have one more to add 
and that is :

While testing the field for entering password, check that 
while entering password the actual password is not 
displayed and symbols like (*) is displayed in order to 
hide it from others.