Show JavaScript widget only on index/main page?

I tried to integrate Twitter (via JavaScript widget) into a (static) blog page; now it shows up everywhere. Is it possible to show it only on the main 开发者_JS百科page and hide it when a visitor reads a sub-page or blog entry?

if(window.location != '/<your main page address>') {
  //do sth to hide or do not show
}