Hello

I have some radios like this :

Code:
<input type="radio" id="1" >a text from db</input>
<input type="radio" id="3" >a text from db</input>
<input type="radio" id="4" >a text from db</input>
id is the id of field from database is it correct ?

How can find the selected Item by clicking on a button ?
I dont want submit form .