Hi people!

I'd like my site's menu hyperlinks to be bold & be a taller size when the mouse rolls over them. I'd like this effect to happen whether the user's browser supports CSS, JS or both.

How could I check through Javascript whether the browser supports CSS please? If the user's browser does support CSS, the Javascript won't need to run as well. I've tried to following, but without success:
Code:
if (document.styleSheets == null) {
    document.getElementById(hlnkToAlter).style.fontWeight = 'bold';
    document.getElementById(hlnkToAlter).style.fontSize = '14px';
}

if (document.styleSheets [0].disabled == false) {
    document.getElementById(hlnkToAlter).style.fontWeight = 'bold';
    document.getElementById(hlnkToAlter).style.fontSize = '14px';
}