matchHeight=function(){
    var divs,contDivs,maxHeight,divHeight,d;
	// get all <div> elements in the document
	divs=document.getElementsByTagName('div');
	contDivs=[];
	// initialize maximum height value
	maxHeight=0;
	// iterate over all <div> elements in the document
	for(var i=0;i<divs.length;i++){
	  // make collection with <div> elements with class attribute 'container'
	  if(/\bcontainer\b/.test(divs[i].className)){
	    d=divs[i];
		contDivs[contDivs.length]=d;
		// determine height for <div> element
		if(d.offsetHeight){
		  divHeight=d.offsetHeight;
		}
		else if(d.style.pixelHeight){
		  divHeight=d.style.pixelHeight;
		}
		// calculate maximum height
		maxHeight=Math.max(maxHeight,divHeight);
      }
	}
	// assign maximum height value to all of container <div> elements
	for(var i=0;i<contDivs.length;i++){
	  contDivs[i].style.height=maxHeight+'px';
	}
  }
  // execute function when page loads
  window.onload=function(){
    if(document.getElementsByTagName){
	  matchHeight();
	}
  }