function setHeights(){
    ca = document.getElementById('internalLeft'); // Variable ca is assigned to the first div 
    cb = document.getElementById('internalCenter'); // etc...
    cc = document.getElementById('internalRight');
    cah = ca.clientHeight; // Variable cah is assigned to height of first div (ca)
    cbh = cb.clientHeight; // etc...
    cch = cc.clientHeight;
    h = (cah > cbh) ? cah : cbh; // If cah > cbh, then set variable h to cah, else set it to cbh
    h = (h > cch) ? h : cch; // Check h against the height of cch and set accordingly
    ca.style.height = h+"px"; // Set all the heights to the h variable
    cb.style.height = h+"px";
    cc.style.height = h+"px";
}

//addLoadEvent(setHeights);
window.addEvent('domready', function(){
  //  setHeights();
});