Javascript: Changing Class Names Issue on IE

IE has issue to change the class of an element using java scrip
   var currentTag = document.getElementById(tagID);
   currentTag.setAttribute("class", "stlyeclass");
this does not work on IE and the work around for the same is
use setAttribute("className", "stlyeclass") instead of setAttribute("class", "stlyeclass");
But funny thing is that it will stop working on fire fox. So to make code cross browser use both some thing demonstrated below:

function changeCSS(tagID)
{
   var currentTag = document.getElementById(tagID);
   currentTag.setAttribute("class", "secondClass");
   currentTag.setAttribute("className", "secondClass");
   return;
}

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