how to use reserved words???

Hi all

I have a procedure and it has the following statement in it

p_statement_header := 'EMP ACCOUNT - TAX INVOICE & ADVICE OF PAY';

So when I try to create the procedure it asks me to input the value for advice.
Enter value for advice:

and I just press enter and everything goes fine. But I dont want it to ask me for the value and I use the following to get rid of it:

p_statement_header := 'EMP ACCOUNT - TAX INVOICE'||' & '|| 'ADVICE OF PAY';

Is there any other way other than this???????

Please let me know.

Thanks in advance.:D

in sql*plus "set define off"