document.onkeydown = function()
{
  if (window.event.altKey)
  {
    alert('Nao utilize ALT+F4 ou ALT+TAB. Use os botoes de navegacao disponiveis no sistema!');
  }
}
function imprimir(text)
	{
	text=document
	print(text)
	}

function janela(str) 
	{
	tipWin1 = window.open(str,'tipWin1','toolbar=no,width=250,height=230,scrollbars=no,resizable=no,top=1,left=500');
	}

function janela_recibo(str) 
	{
	tipWin1 = window.open(str,'tipWin1','toolbar=no,width=640,height=480,scrollbars=yes,resizable=no,top=1,left=300');
	}
// -------------------------------------------------------------------------------------------------------