Save SELECT field value

Hello, I have a select field on my site. The user fills the my form and go to an other site to check it. But if user want to go back to correct some items how can I set the select field to what user chosed before. I mean if the user select a country and write an email and after he wants to correct only the email he shouldn't choose the country again. The values of the select field are not the same as the displayed text. I mean 'German' will be display, but the value of German is 'D'; Is it possible? Thanks!