jQuery(function(){
var $ = jQuery;
positionFooter();
function positionFooter(){
var winH = $(window).height();
var docH = $(document).height();
if( docH <= winH ) {
$('#content').css('margin-bottom','145px');
$("#footer").css({'position': "fixed",'bottom':'0'})
} else {
$('#content').css('margin-bottom','20px')
$("#footer").css({'position': "relative"})
}
}

jQuery(window)
.resize(positionFooter)
});