Is there a way to change case sensitivity in logins?

[sewkitty]

I swear my customers can barely turn a computer on. Many when they join my site & set up their login (it is set to use their email) automatically capitalize the first letter in their email. So when they go back to login & do not capitalize it does not work. It ends up taking me so much time & energy to help them. Is there a way to turn off that case sensitivity option? So as long as they enter in the email it will recognize them (as long as they have the correct password?). I am running an older version of the cart: 1.1.9

Thank you so much!
Elizabeth