// JavaScript Document

function isEmail(text)
{
	var emailFormat = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
	if ( emailFormat.test(text) )
		return true;
	else
		return false;
}

//----------------------------------------------------> http_request part
var http_request = false;
var _function_when_complete = null;

function makeRequest(run_this_function_when_complete,url)
{
    http_request = false;
    if (window.XMLHttpRequest) { // Mozilla, Safari,...
        http_request = new XMLHttpRequest();
        if (http_request.overrideMimeType) {
            http_request.overrideMimeType('text/xml'); 
        }
    }
	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('Giving up  :(  Cannot create an XMLHTTP instance');
        return false;
    }
	_function_when_complete = run_this_function_when_complete;
    http_request.onreadystatechange = _alertfunction_;
    http_request.open('POST', url, true);
	http_request.send(null);
}

function _alertfunction_()
{
    if (http_request.readyState == 4) {//4 = complete
        if (http_request.status == 200 ) {
			if ( _function_when_complete )
				_function_when_complete();
        }
		else {
            alert('There was a problem with the request. '+http_request.status);
        }
    }
}

//----------------------------------------------------> utf8 encoding
function utf8(wide) {
  var c, s;
  var enc = "";
  var i = 0;
  while(i<wide.length) {
    c= wide.charCodeAt(i++);
    // handle UTF-16 surrogates
    if (c>=0xDC00 && c<0xE000) continue;
    if (c>=0xD800 && c<0xDC00) {
      if (i>=wide.length) continue;
      s= wide.charCodeAt(i++);
      if (s<0xDC00 || c>=0xDE00) continue;
      c= ((c-0xD800)<<10)+(s-0xDC00)+0x10000;
    }
    // output value
    if (c<0x80) enc += String.fromCharCode(c);
    else if (c<0x800) enc += String.fromCharCode(0xC0+(c>>6),0x80+(c&0x3F));
    else if (c<0x10000) enc += String.fromCharCode(0xE0+(c>>12),0x80+(c>>6&0x3F),0x80+(c&0x3F));
    else enc += String.fromCharCode(0xF0+(c>>18),0x80+(c>>12&0x3F),0x80+(c>>6&0x3F),0x80+(c&0x3F));
  }
  return enc;
}
//<---------------------------------------------------- utf8 encoding

//----------------------------------------------------> encode64,decode64 part
var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

function encode64(input)
{
   var output = "";
   if ( input.length == 0 )
	   return output;
   var chr1, chr2, chr3;
   var enc1, enc2, enc3, enc4;
   var i = 0;
   do {
      chr1 = input.charCodeAt(i++);
      chr2 = input.charCodeAt(i++);
      chr3 = input.charCodeAt(i++);

      enc1 = chr1 >> 2;
      enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
      enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
      enc4 = chr3 & 63;

      if (isNaN(chr2)) {
         enc3 = enc4 = 64;
      } else if (isNaN(chr3)) {
         enc4 = 64;
      }

      output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2) + 
         keyStr.charAt(enc3) + keyStr.charAt(enc4);
   } while (i < input.length);
   
   return output;
}

function decode64(input)
{
   var output = "";
   var chr1, chr2, chr3;
   var enc1, enc2, enc3, enc4;
   var i = 0;

   // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
   input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

   do {
      enc1 = keyStr.indexOf(input.charAt(i++));
      enc2 = keyStr.indexOf(input.charAt(i++));
      enc3 = keyStr.indexOf(input.charAt(i++));
      enc4 = keyStr.indexOf(input.charAt(i++));

      chr1 = (enc1 << 2) | (enc2 >> 4);
      chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
      chr3 = ((enc3 & 3) << 6) | enc4;

      output = output + String.fromCharCode(chr1);

      if (enc3 != 64) {
         output = output + String.fromCharCode(chr2);
      }
      if (enc4 != 64) {
         output = output + String.fromCharCode(chr3);
      }
   } while (i < input.length);

   return output;
}
//<---------------------------------------------------- encode64,decode64 part