_.template = function(variableName, str, data) {
    var fn = new Function(variableName,
      'var p=[],print=function(){p.push.apply(p,arguments);};' +
      'with('+variableName+'){p.push(\'' +
      str
        .replace(/[\r\t\n]/g, " ")
        .split("<%").join("\t")
        .replace(/((^|%>)[^\t]*)'/g, "$1\r")
        .replace(/\t=(.*?)%>/g, "',$1,'")
        .split("\t").join("');")
        .split("%>").join("p.push('")
        .split("\r").join("\\'")
    + "');}return p.join('');");
    return data ? fn(data) : fn;
  };