function abrirJanela(strUrl, strNomeJanela, strWidth, strHeight)
{ 
                  var WIDTH = strWidth;
                  var HEIGHT = strHeight;
                  var   x = (screen.width - WIDTH)/2;
              var y = (screen.height - HEIGHT)/2;
             
   
                        var windowprops = "dependent=yes, toolbar=no, menubar=no, statusbar=no, scrollbars=auto, resizable=no, titlebar=no, copyhistory=yes, maximized=yes, width=" + WIDTH + ",height=" + HEIGHT +",top=" + y + ",left=" + x +"";
              
                  var janela = window.open(strUrl, strNomeJanela, windowprops);                                       
                   
                  janela.resizeTo(WIDTH + 10, HEIGHT + 35);      
                  janela.focus();
}

var timerID
function startClock(campo){
   //alert('Start..1');
   timerID = window.setTimeout("showClock('"+campo+"')", 2000); // 1-second interval
  // alert('Start..');
}

function stopClock(){
   window.clearTimeout(timerID);
   //alert('Fim');
}

function showClock(campo){
    
   // This function actually displays the time. 
	
	//alert('Oi..');
	
	var ObjId = eval('window.document.forms[0].' + campo); 
	
	if (ObjId != null) 
	{	
		if(ObjId.value == '1')
		{
			stopClock();
			window.document.forms[0].submit();	
		}	
		else
		{
			timerID = window.setTimeout("showClock('"+campo+"')", 1500); // repeat call	
		}
	}
	else
	{
		stopClock();
	} 
}