Ill-logical behaviour of javascript

hello friends
i found a problem
i am trying to draw a dynamic javascript javascript grid with a radio button inside the first col.and i wanted to have diffrent id of radio but with same names. but it didnt happned.

what i did is this

loop starts[

var oRdo= document.createElement("input");
oRdo.id="some dynamic ID";// this will change eaxch time
oRdo.name="rav";
oRdo.type="radio";
oRdo.setAttribute("userID","some dynamic user id")// look this is a user defined attribute

]loop ends

i checked the rendered code it is making all attributes accept name;

then i found another way

var oRdo=document.createElement("<input id='"+some_dynamic_ID+"' name='rav' type='radio'>")

this time it worked.

i am unable to identify why this happned.

can any one suggest

The "id" and "name" attributes are somewhat interchangeable. I would not name them differently in the same element. You could give all the radios the same "class" value, but each should be a matched pair. eg.
<radio id=rad1 name=rad1
<radio id=rad2 name=rad2
<radio id=rad3 name=rad3
I WOULD NOT DO
<radio id=rad1 name=rad
<radio id=rad2 name=rad
<radio id=rad3 name=rad
even if you are able to get this so it seems to be working, you are asking for problems doing it this way.

I think that's a bug in IE.

Don't forget to test in good browsers like Firefox and Opera.

but my requitment is little diffrent.
but i resolved the problem. now it is working prefectly.

var oElement= document.createElement("<input type='text' id='abc' name='rdo' creator='RAVS' ");