$(document).ready( function() {
  var largest = new Array();
  for(var i = 1; i <= 1000; i++) {
    if($(".div_col_"+ i).length <= 0) {
      break;
    }
    largest[i] = 0;
    $(".div_col_"+ i).each( function () {
      if($(this).height() > largest[i]) {
        largest[i] = $(this).height();
      }
    });
    $(".div_col_"+ i).each( function () {
      $(this).height(largest[i]);
    });
  }
});