How to append a string to a label name?

[taj uddin]

Hi,

  In my application, the textfield label name should be appended with "*". I 
tried to add the string (*) to my label name using labelSeparator attribute. In 
my eclipse it shows the warning as "unknown attribut name(labelSeparator). Can 
u pls help me out in this issue.

here (*) was added to my label name to indicate that this particular field is 
required to be filled.

code:

<s:textfield label="Email" labelSeparator="*" name="email" size="60" 
maxlength="50" onkeyup="return autoTab(this, 50, event)"/>