Change Font-size When Opera Detected?

Oct 7, 2009

I need to get JavaScript to change the font size used for a website if Opera is detected. I have been trying this but it hasn't worked:

function changeFooter(){
if (navigator.userAgent.indexOf("Opera") >= 0) { // if I alert this line the output is 0
document.getElementById("footer").style.fontSize = '0.5em';
};

[Code].....

I was hoping that I could benefit from your collective wisdom as I am not sure where I am going wrong with this and several hours spent searching the web for answers have been fruitless so far...

My knowledge of JavaScript is not very extensive, I haven't studied it in great depth so perhaps I am making some very silly mistakes here.

My pseudo code for this exercise is something like this:

detect browser
if browser = Opera {
change font-size for body to 90%
}

[Code]....

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