function getRadioValue(idOrName) {
        var value = null;
        var element = document.getElementById(idOrName);
        var radioGroupName = null;  
        
        // if null, then the id must be the radio group name
        if (element == null) {
                radioGroupName = idOrName;
        } else {
                radioGroupName = element.name;     
        }
        if (radioGroupName == null) {
                return null;
        }
        var radios = document.getElementsByTagName('input');
        for (var i=0; i<radios.length; i++) {
                var input = radios[ i ];    
                if (input.type == 'radio' && input.name == radioGroupName && input.checked) {                          
                        value = input.value;
                        break;
                }
        }
        return value;
}

function toggleLayer(layer) {
var element = document.getElementById(layer);
element.style.display = (element.style.display == "block") ? "none" : "block";

}

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 "";
}