/*
	http://www.somacon.com/p143.php 
	
	Javascript Get or Set Checked Radio Value 
	
	Description
	This pair of Javascript function can get or set the checked value of a 
	group of radio buttons. These functions are specially designed for 
	dynamic pages, and work without error with zero, one, or more radio 
	buttons. Also, because the radio length is saved before looping, this 
	function is much faster. Finally, the functions are granted to the public 
	domain.
 */

	// return the value of the radio button that is checked
	// return an empty string if none are checked, or
	// there are no radio buttons
	function getCheckedValue(radioObj) {
		if(!radioObj)
			return "";
		var radioLength = radioObj.length;
		if(radioLength == undefined)
			if(radioObj.checked)
				return radioObj.value;
			else
				return "";
		for(var i = 0; i < radioLength; i++) {
			if(radioObj[i].checked) {
				return radioObj[i].value;
			}
		}
		return "";
	}
	
	// set the radio button with the given value as being checked
	// do nothing if there are no radio buttons
	// if the given value does not exist, all the radio buttons
	// are reset to unchecked
	function setCheckedValue(radioObj, newValue) {
		if(!radioObj)
			return;
		var radioLength = radioObj.length;
		if(radioLength == undefined) {
			radioObj.checked = (radioObj.value == newValue.toString());
			return;
		}
		for(var i = 0; i < radioLength; i++) {
			radioObj[i].checked = false;
			if(radioObj[i].value == newValue.toString()) {
				radioObj[i].checked = true;
			}
		}
	}