function getRadioCheckedValue(radioName){
	var i = 0;
	var radio = document.getElementsByName(radioName);
	for(; i < radio.length ; i = i + 1){
		if( radio[i].type == "radio" ){
			if( radio[i].checked ){
			 	return radio[i].value;
			}
		}
	}
	if( i == radio.length ){
	 	return "";
	}
}

function checkedRadioByValue(radioName, value){
	var i = 0 ;
	var radio = document.getElementsByName(radioName);
	for(; i < radio.length ; i = i + 1){
		if( radio[i].type == "radio" ){
			if( radio[i].value == value ){
			 	radio[i].checked = true;
			}
		}
	}
}

function enableRadioByName(radioName) {
	var radio = document.getElementsByName(radioName);
	for (var i=0; i<radio.length; i = i + 1) {
		if (radio[i].type == "radio") { 
			radio[i].disabled = false;
		}
	}
}

function disableRadioByName(radioName) {
	var radio = document.getElementsByName(radioName);
	for (var i=0; i<radio.length; i = i + 1) {
		if (radio[i].type == "radio") { 
			radio[i].disabled = true;
		}
	}
}