get_gravatar.js

function get_gravatar(email, size) { 
    // MD5 (Message-Digest Algorithm) by WebToolkit
    function MD5(a){function b(a,b){return a<<b|a>>>32-b}function c(a,b){var c,d,e,f,g;return e=2147483648&a,f=2147483648&b,c=1073741824&a,d=1073741824&b,g=(1073741823&a)+(1073741823&b),c&d?2147483648^g^e^f:c|d?1073741824&g?3221225472^g^e^f:1073741824^g^e^f:g^e^f}function d(a,b,c){return a&b|~a&c}function e(a,b,c){return a&c|b&~c}function f(a,b,c){return a^b^c}function g(a,b,c){return b^(a|~c)}function h(a,e,f,g,h,i,j){return a=c(a,c(c(d(e,f,g),h),j)),c(b(a,i),e)}function i(a,d,f,g,h,i,j){return a=c(a,c(c(e(d,f,g),h),j)),c(b(a,i),d)}function j(a,d,e,g,h,i,j){return a=c(a,c(c(f(d,e,g),h),j)),c(b(a,i),d)}function k(a,d,e,f,h,i,j){return a=c(a,c(c(g(d,e,f),h),j)),c(b(a,i),d)}function l(a){for(var b,c=a.length,d=c+8,e=(d-d%64)/64,f=16*(e+1),g=Array(f-1),h=0,i=0;c>i;)b=(i-i%4)/4,h=8*(i%4),g[b]=g[b]|a.charCodeAt(i)<<h,i++;return b=(i-i%4)/4,h=8*(i%4),g[b]=g[b]|128<<h,g[f-2]=c<<3,g[f-1]=c>>>29,g}function m(a){var d,e,b="",c="";for(e=0;3>=e;e++)d=255&a>>>8*e,c="0"+d.toString(16),b+=c.substr(c.length-2,2);return b}function n(a){a=a.replace(/\r\n/g,"\n");for(var b="",c=0;a.length>c;c++){var d=a.charCodeAt(c);128>d?b+=String.fromCharCode(d):d>127&&2048>d?(b+=String.fromCharCode(192|d>>6),b+=String.fromCharCode(128|63&d)):(b+=String.fromCharCode(224|d>>12),b+=String.fromCharCode(128|63&d>>6),b+=String.fromCharCode(128|63&d))}return b}var p,q,r,s,t,u,v,w,x,o=[],y=7,z=12,A=17,B=22,C=5,D=9,E=14,F=20,G=4,H=11,I=16,J=23,K=6,L=10,M=15,N=21;for(a=n(a),o=l(a),u=1732584193,v=4023233417,w=2562383102,x=271733878,p=0;o.length>p;p+=16)q=u,r=v,s=w,t=x,u=h(u,v,w,x,o[p+0],y,3614090360),x=h(x,u,v,w,o[p+1],z,3905402710),w=h(w,x,u,v,o[p+2],A,606105819),v=h(v,w,x,u,o[p+3],B,3250441966),u=h(u,v,w,x,o[p+4],y,4118548399),x=h(x,u,v,w,o[p+5],z,1200080426),w=h(w,x,u,v,o[p+6],A,2821735955),v=h(v,w,x,u,o[p+7],B,4249261313),u=h(u,v,w,x,o[p+8],y,1770035416),x=h(x,u,v,w,o[p+9],z,2336552879),w=h(w,x,u,v,o[p+10],A,4294925233),v=h(v,w,x,u,o[p+11],B,2304563134),u=h(u,v,w,x,o[p+12],y,1804603682),x=h(x,u,v,w,o[p+13],z,4254626195),w=h(w,x,u,v,o[p+14],A,2792965006),v=h(v,w,x,u,o[p+15],B,1236535329),u=i(u,v,w,x,o[p+1],C,4129170786),x=i(x,u,v,w,o[p+6],D,3225465664),w=i(w,x,u,v,o[p+11],E,643717713),v=i(v,w,x,u,o[p+0],F,3921069994),u=i(u,v,w,x,o[p+5],C,3593408605),x=i(x,u,v,w,o[p+10],D,38016083),w=i(w,x,u,v,o[p+15],E,3634488961),v=i(v,w,x,u,o[p+4],F,3889429448),u=i(u,v,w,x,o[p+9],C,568446438),x=i(x,u,v,w,o[p+14],D,3275163606),w=i(w,x,u,v,o[p+3],E,4107603335),v=i(v,w,x,u,o[p+8],F,1163531501),u=i(u,v,w,x,o[p+13],C,2850285829),x=i(x,u,v,w,o[p+2],D,4243563512),w=i(w,x,u,v,o[p+7],E,1735328473),v=i(v,w,x,u,o[p+12],F,2368359562),u=j(u,v,w,x,o[p+5],G,4294588738),x=j(x,u,v,w,o[p+8],H,2272392833),w=j(w,x,u,v,o[p+11],I,1839030562),v=j(v,w,x,u,o[p+14],J,4259657740),u=j(u,v,w,x,o[p+1],G,2763975236),x=j(x,u,v,w,o[p+4],H,1272893353),w=j(w,x,u,v,o[p+7],I,4139469664),v=j(v,w,x,u,o[p+10],J,3200236656),u=j(u,v,w,x,o[p+13],G,681279174),x=j(x,u,v,w,o[p+0],H,3936430074),w=j(w,x,u,v,o[p+3],I,3572445317),v=j(v,w,x,u,o[p+6],J,76029189),u=j(u,v,w,x,o[p+9],G,3654602809),x=j(x,u,v,w,o[p+12],H,3873151461),w=j(w,x,u,v,o[p+15],I,530742520),v=j(v,w,x,u,o[p+2],J,3299628645),u=k(u,v,w,x,o[p+0],K,4096336452),x=k(x,u,v,w,o[p+7],L,1126891415),w=k(w,x,u,v,o[p+14],M,2878612391),v=k(v,w,x,u,o[p+5],N,4237533241),u=k(u,v,w,x,o[p+12],K,1700485571),x=k(x,u,v,w,o[p+3],L,2399980690),w=k(w,x,u,v,o[p+10],M,4293915773),v=k(v,w,x,u,o[p+1],N,2240044497),u=k(u,v,w,x,o[p+8],K,1873313359),x=k(x,u,v,w,o[p+15],L,4264355552),w=k(w,x,u,v,o[p+6],M,2734768916),v=k(v,w,x,u,o[p+13],N,1309151649),u=k(u,v,w,x,o[p+4],K,4149444226),x=k(x,u,v,w,o[p+11],L,3174756917),w=k(w,x,u,v,o[p+2],M,718787259),v=k(v,w,x,u,o[p+9],N,3951481745),u=c(u,q),v=c(v,r),w=c(w,s),x=c(x,t);var O=m(u)+m(v)+m(w)+m(x);return O.toLowerCase()};
    var size = size || 80; 
    return 'http://www.gravatar.com/avatar/' + MD5(email.trim().toLowerCase()) + '.jpg?s=' + size;
}