calling two ids in one function

[ctoz]

This function ensures an id is visible:

function onV(id){
var v=document.getElementById(id).style;
v.visibility=="hidden"?v.visibility="visible":v.visibility="visible";}

Question is, how to call it twice, on different ids, in the one function? Worth finding a solution, because it's needed several times. Something like

function do2(idA,idB) {
setTimeout('onV(idA)',400); setTimeout('onV(idB)',800);}

I think the original function needs changing, so that the id there includes a second identifier, but not sure how to go about it:

function onV(id+'N'){
var N= ?
var v=document.getElementById(id+'N').style; //etc

Any pointers appreciated.

[daveVk]

leave onV unchanged

setTimeout('onV(idA)',400); setTimeout('onV(idB)',800);}

becomes

setTimeout('onV("' + idA + '")',400); setTimeout('onV("' + idB + '")',800);}

[ctoz]

Many thanks Dave