$(document).ready(function() {
  foot();
});

	
function foot(){
	
  var altezza=$(window).height();
  var hcontent=$('#wrap').height();

hcontent=hcontent+105;


if(altezza>hcontent){
	 var margine=(altezza-hcontent);

  }else{

	var margine=20;
	 }
	 
	$("#footer").css({"marginTop": (margine)+"px"});
	
 }



$(window).resize(function() {
  foot();
});