awesomefooter.js

dojo.require('dojo.window');
dojo.addOnLoad(function(){
    var body = dojo.body(),
        footerId = 'footer'; // change this to whatever your footer's id is.
    
    function adjustFooter(){
        dojo.create('div', {style: 'clear:both', id: 'adjustFooter'}, body);
        var bodySize = dojo.marginBox(body),
            windowSize = dojo.window.getBox(),
            changes = { 'bottom': '0px', 'clear': '', 'position': 'absolute' };
        dojo.destroy('adjustFooter');
        
        if(windowSize.h < bodySize.h){
            changes = { 'bottom': '', 'clear': "both", 'position': 'relative' };
        }
        dojo.style(footerId, changes);
    }
    adjustFooter();    
    
    dojo.connect(window, 'onresize', adjustFooter);
});