Move Element To Y Coordinate

Is there a way to use JavaScript to push a page element (a DIV block,
for example) down the screen, so it sits at the bottom of the browser
window. Code:

Note how the footer is very high up. Is there a way to push the DIV
that the footer is in to the bottom of the browser window?

In pseudocode:

if (where element Y coordinate is above <browser window bottom Y
coordinate>) {
move footer to browser window bottom Y coordinate
}
else {
leave footer where it is , as that means that the content of the page
already pushed it down
}