getElementsByTagName - Loop

Quick question...how would I make the below code only loop every other one

function change(id)
{
var marked = document.getElementsByTagName('TD');
for(var k=0,mark; mark=marked[k]; k++)
{
if(mark.name==id)
mark.className = 'test';
}
}

...James

Change k++ to k = k + 2

Thanks! :thumbsup: When I first tried that route I went K = +2 lol :p know i know where I went wrong. Thanks again