function AbrirPopUp(URL, Titulo, Ancho, Alto)
{
	var Sx=((screen.availWidth - Ancho)/2)-5;
	var Sy=((screen.availHeight - Alto)/2)-15;
	var sFeatures = ''
	
	sFeatures  = 'toolbar=no,directories=no,scrollbars=no,resizable=no,status=no,location=no,';
    sFeatures += 'width=' + Ancho + 'px,height=' + Alto + 'px,top=' + Sy + 'px,left=' + Sx + 'px';
	window.open(URL, Titulo, sFeatures);
}

function trim(s)
{
	while (s.substring(0,1) == ' ')
	{
		s = s.substring(1,s.length);
	}
	while (s.substring(s.length-1,s.length) == ' ')
	{
		s = s.substring(0,s.length-1);
	}
	return s;
}

function IsInteger(oTextBox)
{
	var sValid = '0123456789';
	var sValue = '';
	var i, bReturn = true;;
	sValue = oTextBox.value;
	
	for(i=0; i < sValue.length; i++)
	{
		if(sValid.indexOf(sValue.substring(i , i+1)) == -1)
		{
			bReturn = false;
			break;
		}
	}
	return bReturn;
}