//------------------------------//
function check_all(el)
{

var cntr = document.getElementsByTagName('input');

	for (var i = 0; i < cntr.length; i++)
	{
		if (cntr[i].id == el.id && cntr[i].getAttribute('type') == 'checkbox')
		{
		cntr[i].checked = el.checked
		}
	}
}
//------------------------------//