diff --git a/dist/echo.js b/dist/echo.js
index ae82751..cf21afe 100644
--- a/dist/echo.js
+++ b/dist/echo.js
@@ -4,15 +4,21 @@ window.Echo = (function (global, document, undefined) {
   'use strict';
 
   /**
-   * store
+   * toBeLoaded
    * @type {Array}
    */
-  var store = [];
+  var toBeLoaded = [];
 
   /**
-   * offset, throttle, poll vars
+   * toBeUnloaded
+   * @type {Array}
+   */
+  var toBeUnloaded = [];
+
+  /**
+   * offset, offsetTop throttle, poll, unload vars
    */
-  var offset, throttle, poll;
+  var offset, offsetTop,  throttle, poll, unload;
 
   /**
    *  _inView
@@ -22,7 +28,9 @@ window.Echo = (function (global, document, undefined) {
    */
   var _inView = function (element) {
     var coords = element.getBoundingClientRect();
-    return ((coords.top >= 0 && coords.left >= 0 && coords.top) <= (window.innerHeight || document.documentElement.clientHeight) + offset);
+    var topInView = coords.top >= 0 && coords.left >= 0 && coords.top <= (window.innerHeight || document.documentElement.clientHeight) + offset && coords.top >= -1 * offsetTop;
+    var botInView = coords.bottom >= -1 * offsetTop && coords.left >= 0 && coords.bottom <= (window.innerHeight || document.documentElement.clientHeight) + offset;
+    return topInView || botInView;
   };
 
   /**
@@ -31,24 +39,39 @@ window.Echo = (function (global, document, undefined) {
    * @private
    */
   var _pollImages = function () {
-    var length = store.length;
-    if (length > 0) {
-      for (var i = 0; i < length; i++) {
-        var self = store[i];
+    var loadingLength = toBeLoaded.length,
+        unloadingLength,
+        i,
+        self;
+    if (loadingLength > 0) {
+      for (i = 0; i < loadingLength; i++) {
+        self = toBeLoaded[i];
         if (self && _inView(self)) {
           self.src = self.getAttribute('data-echo');
-          store.splice(i, 1);
-          length = store.length;
+          toBeLoaded.splice(i, 1);
+          loadingLength = toBeLoaded.length;
           i--;
+          if(unload) {
+            toBeUnloaded.push(self);
+          }
         }
       }
-    } else {
-      if (document.removeEventListener) {
-        global.removeEventListener('scroll', _throttle);
-      } else {
-        global.detachEvent('onscroll', _throttle);
+    }
+    unloadingLength = toBeUnloaded.length;
+    if (unloadingLength > 0) {
+      for(i = 0; i < unloadingLength; i++) {
+        self = toBeUnloaded[i];
+        if (self && !_inView(self)) {
+          self.src = self.getAttribute('data-echo-holder');
+          toBeUnloaded.splice(i, 1);
+          unloadingLength = toBeUnloaded.length;
+          i--;
+          toBeLoaded.push(self);
+        }
       }
-      clearTimeout(poll);
+    }
+    if(unloadingLength === 0 && loadingLength === 0) {
+      detach();
     }
   };
 
@@ -72,10 +95,12 @@ window.Echo = (function (global, document, undefined) {
     var nodes = document.querySelectorAll('[data-echo]');
     var opts = obj || {};
     offset = parseInt(opts.offset || 0);
+    offsetTop = parseInt(opts.offsetTop || offset);
     throttle = parseInt(opts.throttle || 250);
+    unload = !!opts.unload;
 
     for (var i = 0; i < nodes.length; i++) {
-      store.push(nodes[i]);
+      toBeLoaded.push(nodes[i]);
     }
 
     _pollImages();
@@ -90,12 +115,25 @@ window.Echo = (function (global, document, undefined) {
 
   };
 
+  /**
+   * detach remove listeners
+   */
+  var detach = function() {
+    if (document.removeEventListener) {
+      global.removeEventListener('scroll', _throttle);
+    } else {
+      global.detachEvent('onscroll', _throttle);
+    }
+    clearTimeout(poll);
+  };
+
   /**
    * return Public methods
    * @returns {Object}
    */
   return {
     init: init,
+    detach: detach,
     render: _pollImages
   };
 
diff --git a/dist/echo.min.js b/dist/echo.min.js
index f736f12..1e0f2c1 100644
--- a/dist/echo.min.js
+++ b/dist/echo.min.js
@@ -1,2 +1,2 @@
 /*! Echo v1.5.0 | (c) 2014 @toddmotto | MIT license | github.com/toddmotto/echo */
-window.Echo=function(a,b){"use strict";var c,d,e,f=[],g=function(a){var d=a.getBoundingClientRect();return(d.top>=0&&d.left>=0&&d.top)<=(window.innerHeight||b.documentElement.clientHeight)+c},h=function(){var c=f.length;if(c>0)for(var d=0;c>d;d++){var h=f[d];h&&g(h)&&(h.src=h.getAttribute("data-echo"),f.splice(d,1),c=f.length,d--)}else b.removeEventListener?a.removeEventListener("scroll",i):a.detachEvent("onscroll",i),clearTimeout(e)},i=function(){clearTimeout(e),e=setTimeout(h,d)},j=function(e){var g=b.querySelectorAll("[data-echo]"),j=e||{};c=parseInt(j.offset||0),d=parseInt(j.throttle||250);for(var k=0;k<g.length;k++)f.push(g[k]);h(),b.addEventListener?(a.addEventListener("scroll",i,!1),a.addEventListener("load",i,!1)):(a.attachEvent("onscroll",i),a.attachEvent("onload",i))};return{init:j,render:h}}(this,document);
\ No newline at end of file
+window.Echo=function(a,b){"use strict";var c,d,e,f,g,h=[],i=[],j=function(a){var e=a.getBoundingClientRect(),f=e.top>=0&&e.left>=0&&e.top<=(window.innerHeight||b.documentElement.clientHeight)+c&&e.top>=-1*d,g=e.bottom>=-1*d&&e.left>=0&&e.bottom<=(window.innerHeight||b.documentElement.clientHeight)+c;return f||g},k=function(){var a,b,c,d=h.length;if(d>0)for(b=0;d>b;b++)c=h[b],c&&j(c)&&(c.src=c.getAttribute("data-echo"),h.splice(b,1),d=h.length,b--,g&&i.push(c));if(a=i.length,a>0)for(b=0;a>b;b++)c=i[b],c&&!j(c)&&(c.src=c.getAttribute("data-echo-holder"),i.splice(b,1),a=i.length,b--,h.push(c));0===a&&0===d&&n()},l=function(){clearTimeout(f),f=setTimeout(k,e)},m=function(f){var i=b.querySelectorAll("[data-echo]"),j=f||{};c=parseInt(j.offset||0),d=parseInt(j.offsetTop||c),e=parseInt(j.throttle||250),g=!!j.unload;for(var m=0;m<i.length;m++)h.push(i[m]);k(),b.addEventListener?(a.addEventListener("scroll",l,!1),a.addEventListener("load",l,!1)):(a.attachEvent("onscroll",l),a.attachEvent("onload",l))},n=function(){b.removeEventListener?a.removeEventListener("scroll",l):a.detachEvent("onscroll",l),clearTimeout(f)};return{init:m,detach:n,render:k}}(this,document);
\ No newline at end of file
diff --git a/src/echo.js b/src/echo.js
index 16fb806..709eb75 100644
--- a/src/echo.js
+++ b/src/echo.js
@@ -3,15 +3,21 @@ window.Echo = (function (global, document, undefined) {
   'use strict';
 
   /**
-   * store
+   * toBeLoaded
    * @type {Array}
    */
-  var store = [];
+  var toBeLoaded = [];
 
   /**
-   * offset, throttle, poll vars
+   * toBeUnloaded
+   * @type {Array}
+   */
+  var toBeUnloaded = [];
+
+  /**
+   * offset, offsetTop throttle, poll, unload vars
    */
-  var offset, throttle, poll;
+  var offset, offsetTop,  throttle, poll, unload;
 
   /**
    *  _inView
@@ -21,7 +27,9 @@ window.Echo = (function (global, document, undefined) {
    */
   var _inView = function (element) {
     var coords = element.getBoundingClientRect();
-    return ((coords.top >= 0 && coords.left >= 0 && coords.top) <= (window.innerHeight || document.documentElement.clientHeight) + offset);
+    var topInView = coords.top >= 0 && coords.left >= 0 && coords.top <= (window.innerHeight || document.documentElement.clientHeight) + offset && coords.top >= -1 * offsetTop;
+    var botInView = coords.bottom >= -1 * offsetTop && coords.left >= 0 && coords.bottom <= (window.innerHeight || document.documentElement.clientHeight) + offset;
+    return topInView || botInView;
   };
 
   /**
@@ -30,24 +38,39 @@ window.Echo = (function (global, document, undefined) {
    * @private
    */
   var _pollImages = function () {
-    var length = store.length;
-    if (length > 0) {
-      for (var i = 0; i < length; i++) {
-        var self = store[i];
+    var loadingLength = toBeLoaded.length,
+        unloadingLength,
+        i,
+        self;
+    if (loadingLength > 0) {
+      for (i = 0; i < loadingLength; i++) {
+        self = toBeLoaded[i];
         if (self && _inView(self)) {
           self.src = self.getAttribute('data-echo');
-          store.splice(i, 1);
-          length = store.length;
+          toBeLoaded.splice(i, 1);
+          loadingLength = toBeLoaded.length;
           i--;
+          if(unload) {
+            toBeUnloaded.push(self);
+          }
         }
       }
-    } else {
-      if (document.removeEventListener) {
-        global.removeEventListener('scroll', _throttle);
-      } else {
-        global.detachEvent('onscroll', _throttle);
+    }
+    unloadingLength = toBeUnloaded.length;
+    if (unloadingLength > 0) {
+      for(i = 0; i < unloadingLength; i++) {
+        self = toBeUnloaded[i];
+        if (self && !_inView(self)) {
+          self.src = self.getAttribute('data-echo-holder');
+          toBeUnloaded.splice(i, 1);
+          unloadingLength = toBeUnloaded.length;
+          i--;
+          toBeLoaded.push(self);
+        }
       }
-      clearTimeout(poll);
+    }
+    if(unloadingLength === 0 && loadingLength === 0) {
+      detach();
     }
   };
 
@@ -71,10 +94,12 @@ window.Echo = (function (global, document, undefined) {
     var nodes = document.querySelectorAll('[data-echo]');
     var opts = obj || {};
     offset = parseInt(opts.offset || 0);
+    offsetTop = parseInt(opts.offsetTop || offset);
     throttle = parseInt(opts.throttle || 250);
+    unload = !!opts.unload;
 
     for (var i = 0; i < nodes.length; i++) {
-      store.push(nodes[i]);
+      toBeLoaded.push(nodes[i]);
     }
 
     _pollImages();
@@ -89,12 +114,25 @@ window.Echo = (function (global, document, undefined) {
 
   };
 
+  /**
+   * detach remove listeners
+   */
+  var detach = function() {
+    if (document.removeEventListener) {
+      global.removeEventListener('scroll', _throttle);
+    } else {
+      global.detachEvent('onscroll', _throttle);
+    }
+    clearTimeout(poll);
+  };
+
   /**
    * return Public methods
    * @returns {Object}
    */
   return {
     init: init,
+    detach: detach,
     render: _pollImages
   };