// VARIABLE BOX HEIGHTS ALL MADE THE SAME HEIGHT
 
function fixH(one,two) {
if (document.getElementById(one)) {
var lh=document.getElementById(one).offsetHeight;
var rh=document.getElementById(two).offsetHeight;
var nh = Math.max(lh, rh); 
document.getElementById(one).style.height=nh+"px";
document.getElementById(two).style.height=nh+"px";
}
}

// ENTER THE IDs OF THE SECTIONS THAT NEED TO BE THE SAME HEIGHT
window.onload=function(){
fixH('container','right-side'); 
fixH2('left','right','centre');
}