$(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);  
      
    });