here is format of emp letter
i dont know whether any website has a sample emp letter or not. but this is the one which i used. try this one.
United states consulate general
bla bla bla (address of the consulate where you are going to)
bla bla
RE: Immigrant visa petition on behalf of AKS1234
LIN-76-987-12345
Dear Sir/Madam:
Samind Inc,. is a permier Information Technology services provider to Fortune 500 companies. We offer a wide range of management and technical services to industry, government and nonprofit organizations throughtout the nation, from which we derive gross annual revenues in excess of $143 million. Samind Inc,. was founded in 1974 and with our staff of 1100 professinal and support personnel, our member firms are able to provide optimum solutions to data processing specific problems.
Samind Inc, filed an immigrant petition for alien worker on behalf of AKS1234, and we continue to support that petition. MR AKS1234 has been offered a full time postions as a programmer analyst with Samind Inc. In this capacity, MR AKS1234 is currently earing an annual salary in the amount of $82,500.
The terms and conditions of the employment have remained essentially the same as described in our I-140 petition. We still intend to offer AKS1234 employment as described in I-140 petition.
If i may answer any questions or be of assistance to you in this regard, please do not hesitate to contact me.
Sincerly,
bla bla bla (give the name of the concerned person in your organization and his/her designation)