Short prompt to set cookie and value

set_cookie_bookmarklet.js

javascript:
function cookiePrompt(){
  var cookieName=prompt("Enter cookie name");
  var cookieValue=prompt("Enter cookie value");
  if(cookieName&&cookieValue){
    var expiryDate = new Date();
    expiryDate.setMonth(expiryDate.getMonth() + 1);
    var cookieString = cookieName + "=" + cookieValue + "; expires=" + expiryDate.toUTCString() + "; path=/";
    document.cookie=cookieString;
    alert("Cookie set: " + cookieString);
  }
}
cookiePrompt();

Minified version:

javascript:function cookiePrompt(){var cookieName=prompt("Enter cookie name");var cookieValue=prompt("Enter cookie value");if(cookieName&&cookieValue){var expiryDate=new Date();expiryDate.setMonth(expiryDate.getMonth()+1);var cookieString=cookieName+"="+cookieValue+"; expires="+expiryDate.toUTCString()+"; path=/";document.cookie=cookieString;alert("Cookie set: "+cookieString);}}cookiePrompt();