function init()
{
	var obj = document.mailform
	obj.pass.value="";
	obj.usr.value="";
	obj.usr.focus();
}
function checkform()
{ 
	var obj = document.mailform
	if(obj.usr.value == "")
	{ 
		//alert("User Name can't for empty!");
		alert("请输入用户名!");
		obj.usr.focus();
		return false;
	}
	if(obj.pass.value == "")
	{
		//alert("Password can't for empty!");
		alert("请输入密码!");
		obj.pass.focus();
		return false;
	}
	return true;
}