enable\disable elements by radiobuttons
===

suppose, I have some content, which i want to fill in, based on radiobuttons, for instance if i click one `radiobutton`, 3 `textarea`s(or `input`s) become active and i can fill them in and the textarea, which "belongs" to other radiobutton, becomes inactive and i can't fill it in and vice versa.

    <form>
    	<input type="radio" name="group1" value="1"> val1<br> 
    
    	<input type="radio" name="group1" value="2" checked> val2<br>
    	
    	<input type="text" value="123123" id="id1">
    	<input type="text" value="123123" id="id2">
    	<input type="text" value="123123" id="id3">
    	<input type="text" value="123123" id="id4">
    </form>