Put javascript function value into input tag value

[michael yue]

How can I put a value returned from a javascript function into the value of a input tag.
example
<input name="ingroup1" type="hidden" value=getGrp()>
where getGrp() is the javascript function as below
function getGrp()
{
var thegrp = document.f0.ingroup.value;
return thegrp;
}
The value passed is getGrp() instead of the real value.
Thanks.

[Eric Pascarello]

it needs to called, you are not calling it...
<input name="ingroup1" type="hidden" onload="this.value=getGrp()">
Eric