Setting uppercase

[wdriley]

I need to set a field to uppercase, regardless of the case of the entry.
I understand the following javascript may allow me to do this, but it doesn't seem to work.
========================================
function Ucase(TextField1)
{
var s = TextField1.rawValue;
TextField1.rawValue = s.toUpperCase();
}

When I attempt to hook this statement to a text field, using the action "mouse enter" to initialize the function and "mouse exit" to run the script, I get nothing.
I obviously need help
Thanks if advance