$(document).ready(function() {
    var boxes = $(".prodbox");
    
    var maxheight = 0;
    $.each(boxes, function(i){
    	var tempheight = $(boxes[i]).height();
    	if(tempheight > maxheight){
    		maxheight = tempheight;
    	}
    });
    
    boxes.height(maxheight);

});