var current = 0;

function show_next()
{
  current = (current+1)%3;
  
  $(".main-news-box-img:lt("+current+")").hide();
  $(".main-news-box-img:eq("+current+")").show();
  $(".main-news-box-img:gt("+current+")").hide();
  
  $(".main-news-box-item > div:lt("+current+")").css("border-color", "#0F0F51");
  $(".main-news-box-item > div:eq("+current+")").css("border-color", "blue");
  $(".main-news-box-item > div:gt("+current+")").css("border-color", "#0F0F51");
  
}

$(document).ready(function() 
{
  $(".main-news-box-img").hide();
  
  $(".main-news-box-img:eq(0)").show();
  
  $(".main-news-box-item > div:first").css("border-color", "blue");
  
  setInterval("show_next()", 7000);
}
);