function radio_button_checker()
{
// set var radio_choice to false
var radio_choice = false;

// Loop from zero to the one minus the number of radio button selections
//alert( "|" + imageForm.Image.length + "|");
if (!(imageForm.Image.length > 0)) 
{
  if (imageForm.Image.checked == true) radio_choice=true;
}

for (counter = 0; counter < imageForm.Image.length; counter++)
{
// If a radio button has been selected it will return true, otherwise, it is set to false

if (imageForm.Image[counter].checked)
radio_choice = true; 
}

if (!radio_choice)
{
// If there were no selections made display an alert box 
alert("Please select an image for your greeting card.")
return (false);
}
return (true);
}