function nextPage(id)
{
    var element = document.getElementById(id);
    var height = element.scrollHeight;
    var scroll = element.scrollTop;
   
    var diff = height - scroll;
    
    if(diff <= 600 && global_block == false && global_maxarticleCount > global_articleCount)
        {
        global_scrollHeight = scroll;
        global_block = true;
        performSearch();
        }
}