function show_field( field_id )
	{
	el = document.getElementById(field_id);
	el.style.display = 'block';
	}

function hide_field( field_id )
	{
	el = document.getElementById(field_id);
	el.style.display = 'none';
	}

function clear_field( obj )
	{		
	obj.value = '';
	}

function clear_data_field( obj )
	{		
	obj.value = '0000-00-00';
	}
	
function SubmitForm(idform)
	{
	document.getElementById(idform).submit();
	}