function $(objId)
{
    return document.getElementById(objId);
}
// 检查是否是手机号码和电话号码
function IsTelephone(obj) 
{ 
//	var pattern=/(^0[2-9][0-9]{1,2}[0-9]{7,8}$)|(^010[0-9]{8}$)|(^1[3,5][0-9]{9}$)/; 
	var pattern = /^((\(\d{3}\))|(\d{3}\-))?13\d{9}|15[01356789]|18[6789]\d{8}$/;
	if(pattern.test(obj)) 
	{ 
		return true; 
	} 
	else 
	{ 
		return false; 
	} 
} 
function IsAuthCode(obj) 
{ 
	var pattern=/(^[0-9]{6}$)/; 
	if(pattern.test(obj)) 
	{ 
		return true; 
	} 
	else 
	{ 
		return false; 
	} 
} 

function IsEmail(obj)
{
	var pattern=/(^[a-z,A-Z])/; 
	if(!pattern.test(obj)) 
		return false; 

	var number_chars = "1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_"; 
	if (obj.length < 4)
		return false;
	var i; 
	for (i=0;i<obj.length;i++) 
	{ 
		if (number_chars.indexOf(obj.charAt(i))==-1) return false; 
	} 
	return true;
}