This page defines an onload function in the global scope:

function onload() {
  alert('onload called');
}

Is onload called when the page loads?

Firefox 2	Internet Explorer 7	Opera 9.24	Safari 3
Yes	No	No	No

If this page were to run the following code:

window.onload = function () {
  alert('onload called');
}

Is onload called when the page loads?

Firefox 2	Internet Explorer 7	Opera 9.24	Safari 3
Yes	Yes	Yes	Yes