var http_request = false;
   
   function makePOSTRequest(url, parameters) {
	  http_request = false;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
         	// set type accordingly to anticipated content type
            //http_request.overrideMimeType('text/xml');
            http_request.overrideMimeType('text/html');
         }
      } else if (window.ActiveXObject) { // IE
         try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!http_request) {
         alert("Cannot create XMLHTTP instance");
         return false;
      }
      http_request.onreadystatechange = alertContents;
      http_request.open('POST', url, true);
	  http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	  http_request.setRequestHeader("Content-length", parameters.length);
	  http_request.setRequestHeader("Connection", "close");
	  http_request.send(parameters);
   }

   function alertContents() {
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            //alert(http_request.responseText);
            result = http_request.responseText;
            document.getElementById("change").innerHTML = result;            
         }
      }
   }
 
function post(obj) {	

  var URL = '';
  var getstr = '';
  for (i=0; i<obj.getElementsByTagName("input").length; i++) {
        if (obj.getElementsByTagName("input")[i].type == "text") {
           getstr += obj.getElementsByTagName("input")[i].name + "=" + 
                   obj.getElementsByTagName("input")[i].value + "&";
        }
		if (obj.getElementsByTagName("input")[i].type == "password") {
           getstr += obj.getElementsByTagName("input")[i].name + "=" + 
                   obj.getElementsByTagName("input")[i].value + "&";
        }
		if (obj.getElementsByTagName("textarea")[i]) {
           getstr += obj.getElementsByTagName("textarea")[i].name + "=" + 
                   obj.getElementsByTagName("textarea")[i].value + "&";
        }
		if (obj.getElementsByTagName("input")[i].type == "hidden") {
           getstr += obj.getElementsByTagName("input")[i].name + "=" + 
                   obj.getElementsByTagName("input")[i].value + "&";
        } 
		if (obj.getElementsByTagName("input")[i].name == "nextPage") {
			URL = obj.getElementsByTagName("input")[i].value;
		}
		
        if (obj.getElementsByTagName("input")[i].type == "checkbox") {
           if (obj.getElementsByTagName("input")[i].checked) {
              getstr += obj.getElementsByTagName("input")[i].name + "=" + 
                   obj.getElementsByTagName("input")[i].value + "&";
           } else {
              getstr += obj.getElementsByTagName("input")[i].name + "=&";
           }
        }
        if (obj.getElementsByTagName("input")[i].type == "radio") {
           if (obj.getElementsByTagName("input")[i].checked) {
              getstr += obj.getElementsByTagName("input")[i].name + "=" + 
                   obj.getElementsByTagName("input")[i].value + "&";
           }
     }  
    if (obj.getElementsByTagName("input")[i].tagName == "SELECT") {
        var sel = obj.getElementsByTagName("input")[i];
        getstr += sel.name + "=" + sel.options[sel.selectedIndex].value + "&";
     }
     
  }
  makePOSTRequest(URL, getstr);
}