function changeClasses(currentdoc){ 
	var inputElements = currentdoc.getElementsByTagName('input'); 
	for (var i=0; i<inputElements.length; i++) { 
			if (inputElements[i].type == "radio"){ 
				inputElements[i].className = inputElements[i].className = "clean"; 
			} 
	} 
}

add_load_event(changeClasses);