function viewPort() {
var h = window.innerHeight || document.documentElement.clientHeight || document.getElementsByTagName('body')[0].clientHeight;
var w = window.innerWidth || document.documentElement.clientWidth || document.getElementsByTagName('body')[0].clientWidth;

return { width : w , height : h }
}

function getFullHeight() {  
      return Math.max(  
         $(document).height(),  
         $(window).height(),  
         document.documentElement.clientHeight  
      );  
};  
//alert('h: ' + viewPort().height + '\r\nw: ' + viewPort().width);