var tw_url = "";
var tw_source = "";
var tw_title = "";
var tw_btype = "b";

var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

function encode64(input)
{
   var output = "";
   var chr1, chr2, chr3;
   var enc1, enc2, enc3, enc4;
   var i = 0;

   input = utf8_encode(input);

   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 utf8_encode(string) 
{
	string = string.replace(/\r\n/g,"\n");
	var utftext = "";
 
	for (var n = 0; n < string.length; n++) {
 
		var c = string.charCodeAt(n);
 
		if (c < 128) {
			utftext += String.fromCharCode(c);
		}
		else if((c > 127) && (c < 2048)) {
			utftext += String.fromCharCode((c >> 6) | 192);
			utftext += String.fromCharCode((c & 63) | 128);
		}
		else {
			utftext += String.fromCharCode((c >> 12) | 224);
			utftext += String.fromCharCode(((c >> 6) & 63) | 128);
			utftext += String.fromCharCode((c & 63) | 128);
		}

	}
 
	return utftext;
}

function do_tlb_setup()
{
	if(typeof(tl_url) !== 'undefined')
	{
		tw_url = tl_url;
		delete tl_url;
	}
	else
	{
		tw_url = window.location.href;
	}

	if(typeof(tl_title) !== 'undefined')
	{
		tw_title = tl_title;
		delete tl_title;
	}
	else
	{
		tw_title = document.title;
	}

	if(typeof(tl_source) !== 'undefined')
	{
		tw_source = tl_source;
		delete tl_source;
	}

	if(tw_source === '')
	{
		tw_source = 'twittlink';
	}
}

do_tlb_setup();



document.write('<script type="text/javascript" src="http://www.twittlink.com/tools/button_'+tw_btype+'_data.js?'+encode64(tw_url)+'_'+encode64(tw_title)+'_'+encode64(tw_source)+'"></script>');