String.prototype.replace = function(pattern, replacement) {
  return this.split(pattern).join(replacement);
}

function btn_over(status, id){
	if ( status == 1 ) {
		source = $(id).src.replace('.jpg', '_over.jpg');
	} else {
		source = $(id).src.replace('_over.jpg', '.jpg');
	}
	$(id).src = source;
	
}


function $RF(el, radioGroup) {
    if($(el).type && $(el).type.toLowerCase() == 'radio') {
        var radioGroup = $(el).name;
        var el = $(el).form;
    } else if ($(el).tagName.toLowerCase() != 'form') {
        return false;
    }
 
    var checked = $(el).getInputs('radio', radioGroup).find(
        function(re) {return re.checked;}
    );
    return (checked) ? $F(checked) : null;
}