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Ошибка в обращении к свойствам


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Есть вот такой код.

<div>
<h3>User Menu</h3>
<ul id="menuuser">
<li></li>
</ul>
</div>

Я делаю вот так.

var myh=document.getElementById("menuuser").parentNode.getElementsByTagName("h3");

myh[0].style.background="image.gif";

Background никак не устанавливается,даже alert(myh[0].style.background) говорит пусто.

Хотя фон точно стоит.

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Так я пробую background и backgroundImage,все равно.Обращение дает пустой результат,причем фон там стоит.

Причем здесь background или backgroundImage, если ты неверно задаешь само значение фона.

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