javascript validation: Did they select a button? any button?

I have 3 radio buttons. I need to have the user select either a trial of the product or one of two subscription options.
see http://ara-usa.org/brizo/

I don't care which button. I don't need the value of the button. I just need to make sure they selected something and, if they didn't, display an message box.
default.html
LyndaPostalAsked:
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GaryCommented:
Just set the first one to selected (or whichever one you want selected by default) then you don't have to worry about one being selected.
So just add selected into your first radio button
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LyndaPostalAuthor Commented:
I understand that ... I would LOVE to do that, but the client (bless their black little heart) wants NOTHING to be assumed. So no pre-selection. But they (of course) want it caught. A polite little message asking the user to please make a selection.

I've been working in vb.net I've not worked in classic asp in a while. And .net validation is drag-n-drop, set some parameters and go (for the most part). I've got two more sites to make changes to by Monday and my head hurts. There has got to be a way to do this.

Please ....
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GaryCommented:
Add to your FORM tag
onsubmit="return checkradio()"

Add this js function
<script>
function checkradio(){
	var radiocheck = false;
	for (var i=0; i < document.form1.selectOption.length; i++){
		if (document.form1.selectOption[i].checked){
			radiocheck = true;
		}
	}  
	if (radiocheck ==false){alert("Select an option");return false;}
}
</script>

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LyndaPostalAuthor Commented:
Thank you so much. I knew it would be simple for someone who knows javaScript. I did Google searches, searched within the ee javascript solutions and could find nothing that simply did a quick radio button validation.

I'm grateful.
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