Radio Buttons

Only one can be chosen at a time, like a car's radio preset buttons (hence the name).
Example:

<INPUT TYPE ="RADIO" NAME="year" VALUE="1" CHECKED>Year 1
<INPUT TYPE ="RADIO" NAME="year" VALUE="2">Year 2
<INPUT TYPE ="RADIO" NAME="year" VALUE="3">Year 3
<INPUT TYPE ="RADIO" NAME="year" VALUE="4">Year 4
<INPUT TYPE ="RADIO" NAME="sal" VALUE="Mr" CHECKED>Mr
<INPUT TYPE ="RADIO" NAME="sal" VALUE="Mrs">Mrs
<INPUT TYPE ="RADIO" NAME="sal" VALUE="Ms">Ms
<INPUT TYPE ="RADIO" NAME="sal" VALUE="Dr">Dr

The radio buttons are identified in groups by the NAME attribute. So, one year can be checked, and one salutation can be checked at the same time, but no more than one from each group.
radio object:

name - the name of the group, as specified in the NAME tag.
length - number of buttons in the group

radio object array:

value - VALUE tag
defaultChecked - CHECKED button
checked - button's current state.
click() - simulates a click. Automatically sets others to false.
If you used the checked attribute, you have to set the others to false manually. How can you do this with a loop?

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Internet II: Day 4