Does anybody knows if it is possible to get a tourist visa (60 days) from Pattaya or Bangkok immigration ? I arrived in Thailand with a 30 days stay permit. But, now, I am ovr 90 days in Thailand, so if I go to Cambodia or Laos I might not be able to re-entry the kingdom and I will not get a new 30 days permit. I only need a 2 weeks extension.

If I go to Vientiane or Pnom Pen will it be possible to get that visa ?

No you can not obtain inside Thailand. Go to Vientiane or Savannakhet in Laos or Malaysia or Singapore. I would not take a chance in Cambodia as they do not have a record of happy customer service.

Does anybody knows if it is possible to get a tourist visa (60 days) from Pattaya or Bangkok immigration ? I arrived in Thailand with a 30 days stay permit. But, now, I am ovr 90 days in Thailand, so if I go to Cambodia or Laos I might not be able to re-entry the kingdom and I will not get a new 30 days permit. I only need a 2 weeks extension.

If I go to Vientiane or Pnom Pen will it be possible to get that visa ?

I don't think they will but you can always try the immigration and ask for an extension for the 2 weeks you need. if they refuse you can then still go to get a visa as Lop suggested.

Does anybody knows if it is possible to get a tourist visa (60 days) from Pattaya or Bangkok immigration ? I arrived in Thailand with a 30 days stay permit. But, now, I am ovr 90 days in Thailand, so if I go to Cambodia or Laos I might not be able to re-entry the kingdom and I will not get a new 30 days permit. I only need a 2 weeks extension.

If I go to Vientiane or Pnom Pen will it be possible to get that visa ?

I don't think they will but you can always try the immigration and ask for an extension for the 2 weeks you need. if they refuse you can then still go to get a visa as Lop suggested.

With a 60day overstay or more if they refuse, won't he be sent to a detention center?

We assume he has been here 90 days on 30 day entry stamps - not that he entered on a 30 day stamp and has not departed. If that were the case he would/should be more concerned about overstay than not being allowed to return. But you could be right.