[XeTeX] accent doubt

[G. Balamurugan]

Hi Will

Thanx for ur swift reply,  i have changed my coding as u instructed but
there is no change in my output,
I have attached the pdf for ur reference, my coding is

\documentclass[20pt]{article}
\font\tnr="Times New Roman/B" at 20pt
\def\mr#1{\mbox{\tnr #1}}

\pagestyle{empty}
\begin{document}
$$\hat{\mr a}$$
\end{document}

thanx in advance

bala
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