jQuery is element in view

// check if element is in view
 
function isScrolledIntoView(elem)
{
    var docViewTop = $(window).scrollTop();
    var docViewBottom = docViewTop + $(window).height();
 
    var elemTop = $(elem).offset().top;
    var elemBottom = elemTop + $(elem).height();
 
    return ((elemBottom <= docViewBottom) && (elemTop >= docViewTop));
}
 
// check if entire element is in view
 
function isScrolledIntoView(elem)
{
    var docViewTop = $(window).scrollTop();
    var docViewBottom = docViewTop + $(window).height();
 
    var elemTop = $(elem).offset().top;
    var elemBottom = elemTop + $(elem).height();
 
    return ((elemBottom >= docViewTop) && (elemTop <= docViewBottom)
      && (elemBottom <= docViewBottom) &&  (elemTop >= docViewTop) );
}