How can I array all select boxes?

This is what I'm trying, and I'm getting nothing out of it:

var allSelectBoxes = document.getElementsByTagName('<select>');
for (i=0;i<allSelectBoxes.length;i++) {
alert(allSelectBoxes[i]);
}

Fixed.

var allSelectBoxes = document.getElementsByTagName('select');
for (i=0;i<allSelectBoxes.length;i++) {
alert(allSelectBoxes[i]);
}