function check_uncheck()
{
	
		if (document.form_mail.checkall.checked==true)
		{
				mail_chkall();
		}
		else
		{
				mail_unchkall();
		}
		
}

function mail_chkall()
{
	for (var i = 0; i < document.form_mail.elements.length; i++)
	{
		var e = document.form_mail.elements[i];
		if (e.name == "delete[]") 
		{
			e.checked = true;
		}
	}
}


function mail_unchkall()
{
	for (var i = 0; i < document.form_mail.elements.length; i++)
	{
		var e = document.form_mail.elements[i];
		if (e.name == "delete[]") 
		{
			e.checked = false;
		}
	}
}