function getRadioValueByName(strName){
	var radio=document.getElementsByName(strName);
	for(var i=0;i<radio.length;i++){
		if(radio[i].checked==true){
			return radio[i].value;
		}
	}
	return null;
}
function $(){
	var elements = [];
	for (var i = 0; i < arguments.length; i++){
		var element = arguments[i];
		if (typeof element == 'string')
			element = document.getElementById(element);
		if (arguments.length == 1)
			return element;
		elements.push(element);
	}
	return elements;
}
function getTableByTd(){
	
}