Aggregate function for a text column

Dear Group,
    I have a table with a column named Supplier_Name
 
    supplier_name
    ==========
Praveen Systems
Zigma Systems
HCL Tech
Vela Book Shop
Senthil Books
Usha Electricals
National Scientific Company
Indian Oil Corporation

Now i want a result like below
      'Praveen Systems, Zigma Systems, HCL Tech, Vela Book Shop, Senthil Books, Usha,
Electricals, National Scientific Company, Indian Oil Corporation'

is it possible in a single query

help me
--
Sathish Kumar.S
SpireTEK