function encode64(inp){
    var key="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
    var chr1,chr2,chr3,enc3,enc4,i=0,out="";
    while(i<inp.length){
        chr1=inp.charCodeAt(i++);if(chr1>127) chr1=88;
        chr2=inp.charCodeAt(i++);if(chr2>127) chr2=88;
        chr3=inp.charCodeAt(i++);if(chr3>127) chr3=88;
        if(isNaN(chr3)) {enc4=64;chr3=0;} else enc4=chr3&63
        if(isNaN(chr2)) {enc3=64;chr2=0;} else enc3=((chr2<<2)|(chr3>>6))&63 
        out+=key.charAt((chr1>>2)&63)+key.charAt(((chr1<<4)|(chr2>>4))&63)+key.charAt(enc3)+key.charAt(enc4);
    }
    return out;
}