Javascript code not working on Firefox browser

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VS2005

ASP.NET

Javascript

, +

Hi everybody,

My ASP.net website has many javascript code and it work nicely on Internet Explorer,

but the problem all javascript code not work on Firefox browser although javascript is enabled on my firefox.

all javascript code never work on firefox whatever it is simple or complicated.

only that code work:

alert("any thing");

but all code not work like that:

document.getElementById("<%= lblRequiredName.ClientID %>").innerText = "qqqq";
myiframe.document.execCommand('justifycenter', 0, null);
myiframe.document.execCommand('createlink');