function form_submit(date) {
  var form = document.getElementById('calendarform'); 
  if(form) form.date.value=date; 
  else { 
	  var form=document.createElement("form");
	  form.setAttribute("name", "calendarform");
	  form.setAttribute("id", "calendarform");
	  form.method = "POST";
	  // input date
	  var inputDate = document.createElement("input");
	  inputDate.setAttribute("type", "hidden");
	  inputDate.setAttribute("name", "date");
	  inputDate.setAttribute("value", date);
	  var inputDate = form.appendChild(inputDate);
	  if(document.all) inputDate.outerHTML = inputDate.outerHTML.replace(/>/, " name="+inputDate.name+">"); 
	  // input params
      var inputDate = document.createElement("input");
      inputDate.setAttribute("type", "hidden");
      inputDate.setAttribute("name", "params");
      inputDate.setAttribute("value", params);
      form.appendChild(inputDate);
	  document.body.appendChild(form); 
  };
  if(replaceDiv != 0) {
      form.setAttribute("action", "getCalendar.php");
      postForm('calendarform', true, function (req) { 
        replaceDivContents(req, 'calendarDiv'); 
      });
  } else {
	  form.submit();
  };
  return;
}