165961 Help to form validation

I have a form today. The form is in the attachment. I need help for a check function that the fields are filled out. I hope that all this can be inside this html page. But if not possible in another file. I have added an attachment (picture of the page) for what fields that must be filled out. Customer must choose one of the product (produkt_1 throug produkt_8) and fill out this fields: - CustomerName - Telefon - Epostadresse - Hvilken_anledning When customer click on send, there must be an error message that arrive. The error message i must could write in my language. - Please fill out Name. - Please fill out mail. It can be with all error message in the one box. This error box must arrive over the page. When they click on X on the error box. They see the form as they filled out. I want this done today. I pick a programmer very fast. Payment will be done when i have uploaded the page and see when it works. And i will of cource write you an good review for helping me.