$(document).ready(function(){  
    //set the starting bigestHeight variable  
    var biggestHeight = 0;  
	
    //check each of them  
    $('.equal_height').each(function(){  
        //if the height of the current element is  
        //bigger then the current biggestHeight value  
        if($(this).height() > biggestHeight){  
            //update the biggestHeight with the  
            //height of the current elements  
            biggestHeight = $(this).height();  
        }  
    });  
	
    //when checking for biggestHeight is done set that  
    //height to all the elements  
    $('.equal_height').height(biggestHeight);  
  
});