mandatory fields

[ajd335]

Hi..
there are some radio buttons,which are mandatory in my site.
So how can i find whether they are filled by the user or not ..so that i can respond accordingly.(i. e if all mandatory fields are remaining then , should be a warning display about the same..)

<input type="radio" name="small" value="N" autocomplete="off"  />
<input type="radio" name="small" value="hidden";value = "required"/>

i have used the second one just to mention the field is required..

[aktar]

[PHP]if (empty($_POST['small'])){

//radio is empty

}else{

//not empty
}[/PHP]