function getViewsize(){

 var viewPortHeight;

 if (typeof window.innerHeight != 'undefined') {
   viewPortHeight = window.innerHeight;
 }
 else if (typeof document.documentElement != 'undefined'
 && typeof document.documentElement.clientHeight !=
 'undefined' && document.documentElement.clientHeight != 0) {
    viewPortHeight = document.documentElement.clientHeight;
 }

 // older versions of IE
 else {
   viewPortHeight = document.getElementsByTagName('body')[0].clientHeight;
 }
 return viewPortHeight;
}

function gotoTop(){
	$('html,body').animate({scrollTop:0});
	return false;
}