Nano.js. A 25-line jQuery impersonator. Incomplete version

nano.js

var $ = function(s){ // Makes the main function (accepts one value)
  var sel = s.substring(1,s.length) // Get's the selector text minus the first character (like #)
  switch (s.charAt(0)){ // Switch based on first chararcter
  case '#': // If it's a #, do document.getElementById
    return document.getElementById(sel)
    break; 
  case '.': // If it's a ., get the element by class name
    var allEls = document.getElementsByTagName('*') 
    for (var i = 0;i<allEls.length;i++){ 
      if (allEls[i].className === sel){ 
        return allEls[i]
      }
    } 
    break; 
  case '*': // If a star, do document.getElementByTagName
    return document.getElementsByTagName(sel) 
    break; 
} 
}