function convert_char(c,b,d,a){return String.fromCharCode(b+(((a.charCodeAt(0)-b)+c)%(c*2)))}function encr(b){var a="";for(var c=0;c<b.length;c++){if(b.charCodeAt(c)>=65&&b.charCodeAt(c)<=90){a=a+convert_char(13,65,90,b.charAt(c))}else{if(b.charCodeAt(c)>=97&&b.charCodeAt(c)<=122){a=a+convert_char(13,97,122,b.charAt(c))}else{a=a+b.charAt(c)}}}return a};