var total_chk=0;
function btn_disabled_check()
{
	if(total_chk > 0)
	{
		if(document.getElementById('top_archive_btn'))
			document.getElementById('top_archive_btn').disabled = false;
		if(document.getElementById('bottom_archive_btn'))
			document.getElementById('bottom_archive_btn').disabled = false;
		if(document.getElementById('top_trash_btn'))
			document.getElementById('top_trash_btn').disabled = false;
		if(document.getElementById('bottom_trash_btn'))
			document.getElementById('bottom_trash_btn').disabled = false;
		if(document.getElementById('top_del_btn'))
			document.getElementById('top_del_btn').disabled = false;
		if(document.getElementById('bottom_del_btn'))
			document.getElementById('bottom_del_btn').disabled = false;
		if(document.getElementById('top_markasread_btn'))
			document.getElementById('top_markasread_btn').disabled = false;
		if(document.getElementById('bottom_markasread_btn'))
			document.getElementById('bottom_markasread_btn').disabled = false;
		if(document.getElementById('top_markasunread_btn'))
			document.getElementById('top_markasunread_btn').disabled = false;
		if(document.getElementById('bottom_markasunread_btn'))
			document.getElementById('bottom_markasunread_btn').disabled = false;
	}
	else
	{
		if(document.getElementById('top_archive_btn'))
			document.getElementById('top_archive_btn').disabled = true;
		if(document.getElementById('bottom_archive_btn'))
			document.getElementById('bottom_archive_btn').disabled = true;
		if(document.getElementById('top_trash_btn'))
			document.getElementById('top_trash_btn').disabled = true;
		if(document.getElementById('bottom_trash_btn'))
			document.getElementById('bottom_trash_btn').disabled = true;
		if(document.getElementById('top_del_btn'))
			document.getElementById('top_del_btn').disabled = true;
		if(document.getElementById('bottom_del_btn'))
			document.getElementById('bottom_del_btn').disabled = true;
		if(document.getElementById('top_markasread_btn'))
			document.getElementById('top_markasread_btn').disabled = true;
		if(document.getElementById('bottom_markasread_btn'))
			document.getElementById('bottom_markasread_btn').disabled = true;
		if(document.getElementById('top_markasunread_btn'))
			document.getElementById('top_markasunread_btn').disabled = true;
		if(document.getElementById('bottom_markasunread_btn'))
			document.getElementById('bottom_markasunread_btn').disabled = true;
	}
}
function chk_click(event)
{
	chk_el = (moz)?event.target:event.srcElement;
	//alert(chk_el.parentNode.parentNode.parentNode.id);
	if(chk_el.checked)
		total_chk++;
	else
		total_chk--;
	
	btn_disabled_check();
	event.cancelBubble = true;
}
function headers_click(p_msg_id)
{
	var chk = document.getElementById('chk'+p_msg_id);
	if(chk)
	{
		chk.checked = !chk.checked;
		if(chk.checked)
			total_chk++;
		else
			total_chk--;
		btn_disabled_check();
	}
}
function check_all()
{
	var els = document.getElementsByTagName('input');
	for(var i=0; i<els.length; i++)
	{
		if((els[i].type) && (els[i].type.toLowerCase() == 'checkbox'))
		{
			chk = els[i];
			if(!chk.checked)
			{
				chk.checked = true;
				total_chk++;
			}
		}
	}
	btn_disabled_check();
}
function uncheck_all()
{
	var els = document.getElementsByTagName('input');
	for(var i=0; i<els.length; i++)
	{
		if((els[i].type) && (els[i].type.toLowerCase() == 'checkbox'))
		{
			chk = els[i];
			if(chk.checked)
			{
				chk.checked = false;
				total_chk--;
			}
		}
	}
	btn_disabled_check();
}