function $(element) {
	if (arguments.length > 1) {
		for (var i = 0, elements = [], length = arguments.length; i < length; i++)
		  elements.push($(arguments[i]));
		return elements;
	}
	if (typeof element == 'string')
		element = document.getElementById(element);
	return element;
}
function ltrim(s){ 
return s.replace( /^\s*/, ""); 
} 
//去右空格; 
function rtrim(s){ 
return s.replace( /\s*$/, ""); 
} 
//去左右空格; 
function trim(s){ 
return rtrim(ltrim(s)); 
} 

function get_word(){
	if(trim($("wall_text").value) =="" ){
		return false;
	}
//var reg = /^[a-zA-Z0-9!.?= ]+$/;   
var reg = /^[a-zA-Z0-9!.,$@!#%&*()<:\-\/?= ]+$/; 
if(reg.test($("wall_text").value)){ 
       alert('您输入的留言需要包含汉字');  
       return false;   
} 
}
function get_group(){
	if(trim($("name").value) =="" || trim($("sec_blurb").value) =="" ){
		return false;
	}
}

function check_login(){
	if(trim($("user_name").value) =="" || trim($("pass").value) =="" ){
		return false;
	}
}