can I get help on DOB validation on magento

I am new in magento I would to validate my DOB fileds on the registratoin page so that valid dates can be inserted by the user, at the moment the input fieds accept anyt开发者_如何学Ching and a user can input any number of text and it accepts can you guys please help?

Look in your theme's (or default) template/customer/form/widget/dob.phtml file. It creates three strings which describe the three text inputs for day, month and year. You can either add the validate-number name to their class or rewrite them to use <select> elements instead.