title: jQuery: send keystroke
body: <p>i'm having a widget with a search-textbox. when pressing enter in it, search starts.</p>
  
  <p>i now want to trigger that enter key by code. in other words, i want to send the enter-keystroke to the textbox.</p>
  
  <p>how does it work?</p>
  
  <p>thx</p>