function clearRB(buttonGroup)
{
   for (i=0; i < buttonGroup.length; i++) {
   
       if (buttonGroup[i].checked == true) { // if a button in group is checked,
             buttonGroup[i].checked = false;   // uncheck it
      }
      
   }   
}

function unCheckRadio(oRadio) {
	  var or = document.getElementsByName(oRadio);
      for (var i = 0; i < or.length; i++) {
         or[i].checked = false;
     }
}