var cont = 285;
var iInterval;

$(document).ready(function(){
    start();
    $('#ol_scroll').mouseover(function(){ pause(); return; });    
    $('#ol_scroll').mouseout(function(){ start(); return; });
});
function start(){
    clearInterval(iInterval);
    iInterval = setInterval("cont--; $('#ol_scroll').css('top', cont+'px'); if(cont == -3000)cont = 285;", 50);
    return;
}
function pause(){
    clearInterval(iInterval);
    return;
}