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; 
} 

} 

// execute function when page loads 
window.onload=function(){ 
if(document.getElementsByTagName){ 
matchHeight(); 
} 

}