Elaheh, which kit have you been using? Have you tried to contact the manufacturer? Sometimes they will tell you what's in the buffers. Probably not, but worth a try? If not, I like Nature protocols and found this one there that may help you http://www.nature.com/nprot/journal/v2/n10/pdf/nprot.2007.311.pdf
Let me know if you are not able to view this and I will send pdf
If you prefer to use PBS then just make this up and use in place of the TBS, adding detergent where appropriate. The rest of the protocol will be as written. It shouldn't make any difference though whether you use TBS or PBS.
@amanda ,i want to use nunc protocol here attached,but the solutions are simpler than other protocol foe example hybridization buffer is just sodium buffer phosphate ,do u thik is it good?