Contact Us form in PHP drop down menu issue

Our client has a web site in PHP. On web site, there is a contact us form in PHP with form validation. No data base used in contact us form. Contact us Form fields - * All form fields are mandatory. Full Name:_____________ Email: ______________ Skype ID: ______________ Telephone: _____________ Country: _____________ Message: _____________ :: Problem/Work task :: Country input filed is a drop down menu which is creating problem as a user must select his country before submitting the form or in-case of error the Country filed is not saved. Once a user hits the submit button, the Contact Us form uses PHP script to validate all form fields and sanitize the input data. All form fields are mandatory and with proper format. Example of a problem: If a user submits the Contact Us form and leaves telephone filed empty then PHP form generates an error on next page "Please go back and fix these errors." and ask the user to click on back button as user must type in his telephone number inside telephone filed because all form fields are mandatory. The problem is that once a user hits the back button and type his telephone number he has to select again his correct country from the drop down menu. Rest of the input fields echo previously entered input data. In-case of error and hitting the back button, we want to save the country selection. So, a user must not re-select the country from the drop down menu. :: Terms :: We always pay for completed work and you can check our profile. You will not get access to FTP or Web site server. We will provide you PHP scripts files. You will need to test it and fix php issue at your end. Next provide us correct php files and we will upload it on server. :: Payment :: If we award you this project, we will place 100% money inside the milestone. Once you complete 100% work and our client tested it, then we will release the milestone payment. :: Work experience :: We are not interested to award this project to new freelancers and you must provide your past work reference before we award you this project.