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Thank you so much,

I changed my code through your answer.

function menu_click(url) {
var el = document.getElementById('degiskenicerik');
el.src = url;
...

Hello,

I have a an Iframe in my html code like this;
<iframe id="degiskenicerik" scrolling="yes" src="http://localhost:16413/ZikriSinoglu/Idari.htm" frameborder=0 name="degiskenicerik"></iframe>...