HELP! :- JavaScript problem

[p9l]

Hi,I have a java script problem...
I have a javascript which concatenate the four drop down boxes.
function concate(fm,fy,tm,ty)
{
var QI00=fm.options[fm.selectedIndex].value;
var QI01=fy.options[fy.selectedIndex].value;
var QI02=tm.options[tm.selectedIndex].value;
var QI03=ty.options[ty.selectedIndex].value;
var QI0=QI00+QI01+QI02+QI03

}

how do I use QI0 again outside javascript??
this is what I mean!
<input name="QI0" type="hidden" value=?????>
I want this hidden field value as the QI0 value from the function!

HELP Pls.....

[Jon Hanlon]

[code]

function concate(fm,fy,tm,ty) {
var QI00=fm.options[fm.selectedIndex].value;
var QI01=fy.options[fy.selectedIndex].value;
var QI02=tm.options[tm.selectedIndex].value;
var QI03=ty.options[ty.selectedIndex].value;
var QI0=QI00+QI01+QI02+QI03;
return Q10;
}

document.getElementById("Q10").value = concate(fm,fy,tm,ty);
/* OR */
document.forms.<<FORMNAME>>.Q10 = concate(fm,fy,tm,ty);

<input id="Q10" name="QI0" type="hidden" value="?????">

If you can't get it to work then please post the whole page.

[Android]

Is that return Q10; or return QI0;?
Is that a 1 (one) or an I (uppercase 9th letter of the alphabet)?

[p9l]

thanks.
I want the value of the hidden field to be the value QI0 from the function!
<input name="QI0" type="hidden" value=function return value>

[p9l]

I have worked it out now!
Thanks guys..