// JavaScript Document
window.onload = function() {
  var tbl = document.getElementsByTagName("table");
  for (var i = 0; i < tbl.length; i++) {
    if (tbl[i].className == "price1") {
      stripeTable(tbl[i]);
    }
  }
}

function stripeTable(t) {
  for (var i = 0; i < t.rows.length; i++) {
    if ( i % 2 == 0) { t.rows[i].className = "bg_even" }
  }
}