a Freelance Web Developer

jQuery.fn.deleteLastWord = function() {
  this.each(function(){
    if (this.selectionStart || this.selectionStart == '0') {
      var startPos = this.selectionStart;
      var endPos = this.selectionEnd;
      var scrollTop = this.scrollTop;
 
      var lastWord = $(this).lastWord();
      startPos = startPos - lastWord.length;
 
      this.value =
          this.value.substring(0, startPos) +
          this.value.substring(endPos, this.value.length);
      this.focus();
      this.selectionStart = startPos;
      this.selectionEnd = startPos;
      this.scrollTop = scrollTop;
    } else {
      alert("deleteLastWord not supported on this navigator");
    }
  });
};

$('#my_textarea').deleteLastWord();

jQuery.fn.lastWord = function() {
  var buffer = '';
 
  this.each(function(){
    if (this.selectionStart || this.selectionStart == '0') {
      var startPos = this.selectionStart;
      var endPos = this.selectionEnd;
      var scrollTop = this.scrollTop;
 
      var index = 0;
      var new_char = '';
 
      do{
        index += 1;
        buffer = new_char + buffer;
        new_char = this.value.substr(startPos - index, 1);
      } while( new_char.search( /^(\w|\.)$/|> ) != -1 )
 
    } else {
      alert("lastWord not supported on this navigator");
    }
  });
 
  return buffer;
};

alert( "last word from cursor: " + $('#my_textarea').lastWord() );

img1 = new Image();
img1.src="imagen.jpg";

class Preloator
  def self.generate_script( css_directory )
    # take all .css on directory
    css_file_names = []
    Dir.foreach( css_directory ) do |file|
      if file =~ /.*\.css$/
        css_file_names << css_directory + '/' + file
      end
    end
 
    # take all the images by looking at 'url'
    image_names = []
    css_file_names.each do |file_name|
      self.grep( 'url', file_name ).each do |line|
        image_names << line.scan( /.*\((.*)\)/ ).flatten.first
      end
    end
 
    # generate the script
    script = "<script>\n"
    image_names.each_with_index do |image_name, index|
      script += "    img#{index} = new Image();\n"
      script += "    img#{index}.src = \"#{image_name}\";\n"
    end
    script += "</script>"
  end
 
  def self.grep( pattern, filename )
    matches = []
    regexp = Regexp.new( pattern )
    File.open(filename) do |file|
      file.each do |line|
        matches << "#{filename} #{file.lineno.to_s}: #{line}" if regexp.match(line)
      end
    end
    matches
  end
end
 
puts Preloator.generate_script( ARGV[0] )

$ ruby etc/preloator.rb public/stylesheets/
<script>
img0 = new Image();
img0.src="/imgs/fondo.jpg";
img1 = new Image();
img1.src="/imgs/fondo_carpeta.png";
img2 = new Image();
img2.src="/imgs/blog_sombra_abajo.png";
img3 = new Image();
</script>;