Function builder - allows to save more space (74 chars)

function-builder.js

//Function builder
var functionBuilder = function (args, body) {
    var argsAsString = args.split(',').toString();
    return eval('(function(' + argsAsString + '){' + body + '})');
}

//minifed (74 chars)
var f=function(a,b){return eval("(function("+""+a.split(",")+"){"+b+"})")}

//sample usage
f('event,a,b,c,d,e', 'return 1')();