function Base64(){_keyStr="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";this.encode=function(input){var output=new Array();var chr1,chr2,chr3;var enc1,enc2,enc3,enc4;var i=0;input=_utf8_encode(input);while(i<input.length){chr1=input[i++];chr2=input[i++];chr3=input[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.push(_keyStr.charAt(enc1)+_keyStr.charAt(enc2)+_keyStr.charAt(enc3)+_keyStr.charAt(enc4))}return output.join("")};this.decode=function(input){var output="";var chr1,chr2,chr3;var enc1,enc2,enc3,enc4;var i=0;input=input.replace(/[^A-Za-z0-9\+\/\=]/g,"");while(i<input.length){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)}}output=_utf8_decode(output);return output};_utf8_encode=function(string){string=string.replace(/\r\n/g,"\n");var utftext=new Array();var utftextlen=0;for(var n=0;n<string.length;n++){var c=string.charCodeAt(n);if(c<128){utftext[utftextlen++]=c}else{if((c>127)&&(c<2048)){utftext[utftextlen++]=(c>>6)|192;utftext[utftextlen++]=(c&63)|128}else{utftext[utftextlen++]=(c>>12)|224;utftext[utftextlen++]=((c>>6)&63)|128;utftext[utftextlen++]=(c&63)|128}}}return utftext};_utf8_decode=function(utftext){var string="";var i=0;var c=c1=c2=0;while(i<utftext.length){c=utftext.charCodeAt(i);if(c<128){string+=String.fromCharCode(c);i++}else{if((c>191)&&(c<224)){c2=utftext.charCodeAt(i+1);string+=String.fromCharCode(((c&31)<<6)|(c2&63));i+=2}else{c2=utftext.charCodeAt(i+1);c3=utftext.charCodeAt(i+2);string+=String.fromCharCode(((c&15)<<12)|((c2&63)<<6)|(c3&63));i+=3}}}return string};_exchange_character=function(charArray){charArray=charArray.split("");for(var i=0;i<charArray.length;i++){if(i>0&&i%2==0){var c=charArray[i];charArray[i]=charArray[i-1];charArray[i-1]=c}}return charArray.join("")};this.encodePostParam=function(input){input=this.encode(input).split("").reverse().join("");return _exchange_character(input)};this.decodePostParam=function(input){input=_exchange_character(input).split("").reverse().join("");return this.decode(input)}};