JavaScript : Set Text Font to Bold at Runtime

Hi I have one textbox named txtName and I want to make it's style to bold and regular at runtime in onFoucs event.

I used this but no result...
document.Form1.txtName.style.font.bold=true;

Code:

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var txtName = document.getElementById('txtName');
if(txtName) { txtName.style.fontWeight = 'bold'; }

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The element must have id="txtName" attribute for this to work.

For more details on CSS see W3C CSS property index; JavaScript uses the same names, except that properties with - character don't have it, instead the next character will be upper case. (ie. font-weight -> fontWeight).

Thanks u very much Merri..