I am confused about the differences between this.window.focus(),
window.focus(), and this.focus().
I want to use the calls in a <body onload="..."> tag. What are the
differences between these forms that may make one succeed and another
fail? In particular, this.window.focus() fails in Opera 9.10 with an
"object not found", and windows.focus() succeeds in Opera 9.10, Firefox
2.02, and IE 7.