$(document).ready(function() {
    scroll('#scroller', '#scrollportal');
});


function scroll(scrollerid, scrollportal){
    
    
    var thescroller = $(scrollerid);
    var scrollerheight = parseInt(thescroller.css('height'));
    //console.log("scrollerheight: " + scrollerheight);
    var scrollamt = (scrollerheight * -1);
    var resetpos = $(scrollportal).height();
    thescroller.animate({
       'top':  scrollamt + 'px'
    }, 25000, 'linear', function(){
        thescroller.css('top', resetpos);
        scroll(scrollerid, scrollportal);
    });
    
}