18. A computer readable medium storing instructions that upon execution by a processing device cause the processing device to perform operations, comprising: receiving a request in a user interface to translate a source web document at a location from a first language text to a second language text, the request including a uniform resource locator corresponding to the source web document; communicating the request to a translation engine; receiving a translated web document in the second language text wherein predetermined portions of the second language text in the translated web document are delimited by tags; displaying the translated web document in the user interface; and displaying the first language text that corresponds to one of the predetermined portions of the second language text in a graphical element overlaying the second language text in the user interface in response to a user pointing to the one of the predetermined portions of the second language text.
18. A computer readable medium storing instructions that upon execution by a processing device cause the processing device to perform operations, comprising: receiving a request in a user interface to translate a source web document at a location from a first language text to a second language text, the request including a uniform resource locator corresponding to the source web document; communicating the request to a translation engine; receiving a translated web document in the second language text wherein predetermined portions of the second language text in the translated web document are delimited by tags; displaying the translated web document in the user interface; and displaying the first language text that corresponds to one of the predetermined portions of the second language text in a graphical element overlaying the second language text in the user interface in response to a user pointing to the one of the predetermined portions of the second language text. 20. The computer readable medium of claim 18 , wherein the tags having a title attribute set to the first language text.