Control buttons and validators

Hi I need to make a project for school and making a registration form.

Now I have 3 problems:

1. I need to check that the email and postcode are filled in and if they are filled in I need to see that they are right , the last thing I did with the RegularExpressionValidator but the first ting you can't check with this.

 2. I want to make a reset button so when you click that all the values get reseted.

3. I want something like here on the site when you register you need to retyp the words that are displayed.

 

I hope someone can help me.

 

Thanks in advance
...