defaulty selecting one radio button

i have 2 radio buttons, when the time of form load one must checked defaulty.

tags are

<html:radio property="exporttype" value="ascii"/><bean:message key="app.ascii"/>

<html:radio property="exporttype" value="csv"/><bean:message key="app.csv"/></td>

how to do this in java script

thanks in advance

[365 byte] By [RaviKumar.Avulaa] at [2007-11-27 7:50:24]