$(document).ready(function(){
  $("body").append('<div id="show_real_size_img"><img scr=""/></div>').children("#show_real_size_img").css({
   "position":"absolute",
   "left":"-999999px",
   "top":"-999999px"
  });
  $(".content img").each(function(){// ".content" - блок с контентом
    
   $(this).load(function(){
    if($("#show_real_size_img img").attr("src",$(this).attr("src")).width()>($(".content").width()/*Увеличивать картинку при клике, если её ширина больше ширины блока с контентом*/)){
     $(this).click(function(){
      $("body").append('<div id="show_full_size_img_overlay"><img src=""/></div>').children("#show_full_size_img_overlay").one("click",function(event){
       $("#show_full_size_img_overlay").remove();
      }).css({
       "position":"fixed",
       "top":"0px",
       "right":"0px",
       "bottom":"0px",
       "left":"0px",
       "margin":"auto",
       "background":"rgba(0,0,0,0.5)",
       "z-index":"100"
      }).children("img").one("click",function(event){
       event=event||window.event;
       event.stopPropagation?event.stopPropagation():(event.cancelBubble=true);
      }).attr("src",$(this).attr("src")).css({
       "position":"absolute",
       "top":"0px",
       "right":"0px",
       "bottom":"0px",
       "left":"0px",
       "margin":"auto",
       "padding":"10px",
       "border-radius":"7px",
       "background":"#EEE"
      });
      if($("#show_full_size_img_overlay img").width()>($(window).width()-50) && $("#show_full_size_img_overlay img").height()>($(window).height()-50)){
       $("#show_full_size_img_overlay img").css({"width":($(window).width()-50)+"px","height":"auto"});
       if($("#show_full_size_img_overlay img").height()>($(window).height()-50)){
        $("#show_full_size_img_overlay img").css({"width":"auto","height":($(window).height()-50)+"px"});
       };
      }else if($("#show_full_size_img_overlay img").width()>($(window).width()-50) && $("#show_full_size_img_overlay img").height()<=($(window).height()-50)){
       $("#show_full_size_img_overlay img").css({"width":($(window).width()-50)+"px","height":"auto"});
      }else if($("#show_full_size_img_overlay img").width()<=($(window).width()-50) && $("#show_full_size_img_overlay img").height()>($(window).height()-50)){
       $("#show_full_size_img_overlay img").css({"width":"auto","height":($(window).height()-50)+"px"});
      }else{
       $("#show_full_size_img_overlay img").css({"width":"auto","height":"auto"});
      }
     }).css("cursor","pointer");
    }
    if($(this).attr("src")==$(".content img").last().attr("src")) $("#show_real_size_img").remove();
   }).error(function(){var src=this.src+"?"+Math.random(),self=this;setTimeout(function(){$(self).attr("src",src);},3000);});
  });
});