remote image to base64

// credit: http://snipplr.com/view.php?codeview&id=56433
//
var xmlhttp = new XMLHttpRequest();
xmlhttp.open("GET",'favicon.ico',false);
xmlhttp.overrideMimeType('text/plain; charset=x-user-defined');
xmlhttp.send();
var data = '';
for ( var i = 0; i < xmlhttp.responseText.length; i++ ) data += String.fromCharCode( ( xmlhttp.responseText[ i ].charCodeAt(0) & 0xff ) );
// Convert raw data to base64
data = btoa( data );
var base64src='data:image/jpg;base64,'+data;  // change the MIME type according to content
document.getElementById("foo").src = base64src;
console.log(base64src);