Заморозка скроллинга страницы
 

Замораживаю scroll окна следующим скриптом:

var prevent = function(event) { 
    window.scrollTo(0, 0); 
    event ? event.preventDefault() : window.event.returnValue = false; 
}; 
   
if(window.addEventListener) { 
    var array = ['DOMMouseScroll', 'mousewheel', 'scroll'], 
        i = array.length; 
   
    while(i--) { 
        window.addEventListener(array[i], prevent, false); 
    } 
} 
else window.onmousewheel = document.onmousewheel = window.onscroll = prevent;

Пытаюсь разморозить следующим:

if(window.addEventListener) { 
    var array = ['DOMMouseScroll', 'mousewheel', 'scroll'], 
        i = array.length; 
   
    while(i--) { 
        window.removeEventListener(array[i], prevent, false); 
    } 
} 
else window.onmousewheel = document.onmousewheel = window.onscroll = null;

Почему этот скрипт не работает в Opere?

предлагаю свою версию заморозки скролла

var locked;

var prevent = function(event) {
    window.scrollTo( 0,locked );
    event ? event.preventDefault() : window.event.returnValue = false;
};


document.getElementsByTagName("button")[0].onclick = function() {

    var freezed = +this.getAttribute("freezed");



          window.addEventListener &&

               ['DOMMouseScroll', 'mousewheel', 'scroll'].forEach(function(a) {
                    window[ (freezed?"remove":"add")+'EventListener' ] (a, prevent, false);
               })
    
          || 

               (window.onmousewheel =
               document.onmousewheel =
               window.onscroll = (freezed?null:prevent));

           
     locked = window.innerWidth ? window.pageYOffset : document.documentElement && document.documentElement.clientWidth ? document.documentElement.scrollTop : document.body.clientWidth ? document.body.scrollTop : 0;

               
     this.setAttribute("freezed", ++freezed % 2);
}

пример :

проверил во всем... IE7+. работает вроде :)

<button freezed="0" style="position:fixed">freeze</button>





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Donec congue, sem et dapibus posuere, lorem metus dapibus lacus, at consectetur ipsum nibh ut lectus. Praesent sed augue vitae lorem mollis dapibus. Curabitur auctor, risus volutpat porta rutrum, lacus odio mollis risus, eget molestie erat augue ut nulla. Phasellus tincidunt lacus vel orci aliquam scelerisque. Maecenas et orci lacus. Fusce in odio orci, at interdum neque. Curabitur sit amet sapien dolor, id pulvinar arcu. Integer vel mattis quam.

Pellentesque hendrerit, nulla a dictum pharetra, mauris augue ultricies magna, aliquet ornare mi ipsum in magna. Aenean at suscipit leo. Praesent pulvinar tempor vehicula. Nullam tempus risus at nisi dapibus ultrices. Nunc laoreet neque at neque interdum malesuada. Cras mauris justo, pretium eu interdum ac, aliquam id nunc. Aliquam dapibus laoreet purus eget euismod. Aliquam dui orci, molestie non pulvinar in, pulvinar id lectus. Praesent
<script>
var locked;

var prevent = function(event) {
    window.scrollTo( 0,locked );
    event ? event.preventDefault() : window.event.returnValue = false;
};


document.getElementsByTagName("button")[0].onclick = function() {

    var freezed = +this.getAttribute("freezed");



          window.addEventListener &&

               ['DOMMouseScroll', 'mousewheel', 'scroll'].forEach(function(a) {
                    window[ (freezed?"remove":"add")+'EventListener' ] (a, prevent, false);
               })
    
          || 

               (window.onmousewheel =
               document.onmousewheel =
               window.onscroll = (freezed?null:prevent));

           
     locked = window.innerWidth ? window.pageYOffset : document.documentElement && document.documentElement.clientWidth ? document.documentElement.scrollTop : document.body.clientWidth ? document.body.scrollTop : 0;

               
     this.setAttribute("freezed", ++freezed % 2);
}



</script>

Спасибо за помощь.
Очередной раз убеждаюсь, что это очень полезный форум.