`

// Script-as-app template.
function doGet() {
  var app = UiApp.createApplication().setTitle('Business Card Mini Gallery | MAvC Graphics.').setHeight(50).setWidth(100)
  return HtmlService.createTemplateFromFile('minigallery')
      .evaluate();
}

function include(customcss) {
  return HtmlService.createHtmlOutputFromFile(customcss)
      .getContent();
}
function include(layoutcss) {
  return HtmlService.createHtmlOutputFromFile(layoutcss)
      .getContent();
}
function include(minigallerycss) {
  return HtmlService.createHtmlOutputFromFile(minigallerycss)
      .getContent();
}
function include(eyesjs) {
  return HtmlService.createHtmlOutputFromFile(eyesjs)
      .getContent();
}
function include(jqueryjs) {
  return HtmlService.createHtmlOutputFromFile(jqueryjs)
      .getContent();
}
function include(layoutjs) {
  return HtmlService.createHtmlOutputFromFile(layoutjs)
      .getContent();
}
function include(utilsjs) {
  return HtmlService.createHtmlOutputFromFile(utilsjs)
      .getContent();
}
function include(minigalleryjs) {
  return HtmlService.createHtmlOutputFromFile(minigalleryjs)
      .getContent();
}

<?!= include('customcss'), ('layoutcss'), ('minigallerycss'); ?>

...//lengthy inner page code

<?!= include('eyesjs'), ('jqueryjs'), ('layoutjs'), ('minigalleryjs'), ('utilsjs'); ?>