function sf(sf_id)
{
	document.getElementById(sf_id).focus();
}

function send_enter(event, form_to_submit)
{	
	//if enter pressed
	if ((window.event && window.event.keyCode == 13) || (event && event.which == 13))
	{
		document.getElementById(form_to_submit).submit();
	}
}

function show_block(b_id)
{
	document.getElementById(b_id).style.display = "block";
}

function hide_block(b_id)
{
	document.getElementById(b_id).style.display = "none";
}