function LoginCheck()
{
	
	var username=form1.username.value;
	var password=form1.password.value;
	if(username==""||username==null)
	{
		alert("对不起！\n\n请先输入登陆用户名！");
		document.form1.username.focus();
		return;
	}
	if(password==""||password==null)
	{
		alert("对不起！\n\n请先输入登陆密码！");
		document.form1.password.focus();
		return;
	}
	document.form1.submit();
}