var dlform = document.createElement('form');

dlform.style = "display:none;";

dlform.method = 'post';

dlform.action = '../fileServlet';

dlform.target = 'callBackTarget';

var hdnFilePath = document.createElement('input');

hdnFilePath.type = 'hidden';

hdnFilePath.name = 'filePath';

hdnFilePath.value = filePath;

dlform.appendChild(hdnFilePath);

document.body.appendChild(dlform);

dlform.submit();

document.body.removeChild(dlform);