matchColumns=function(){ 

     var divs,contDivs,maxHeight,divHeight,d, mainDiv; 
	
     // 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(/\bcolumn\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); 

          }
     }
	for (var j = 0; j < contDivs.length; j++) {
		contDivs[j].style.height = (maxHeight) + "px";
	}
}