// JavaScript Document
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(/\bheight_max\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