Replace some text on your page with the value of a URL parameter

replace_text_with_url_param.js

<script type="text/javascript">
var getUrlParams = function() {
  var params = {}, hash;
  var hashes = decodeURI(window.location.href).replace(/\+/g," ").slice(window.location.href.indexOf('?') + 1).split('&');
  for (var i=0; i<hashes.length; i++) {
    hash = hashes[i].split('=');
    params[hash[0]] = hash[1];
  }
  return params;
};
jQuery(function() {
  // This assumes you have a parameter in your URL called "utm_keyword"
  var utm_keyword = getUrlParams()['utm_keyword'];
  if (utm_keyword != undefined) {
    // This assumes you've given an element on the page and ID of "keyword"
    jQuery('#keyword').html(utm_keyword);
  }
});
</script>

The replace("+"," ") only converts the first + into a space.
It should be replace(/\+/g," ") to change all of them (using a global regex).

Updated, thanks Evan!

I can't seem to get this to handle the %2B in the URLs that come from Google. Any suggestions?

Okay, I figured it out. Pretty good for a non-programmer. Here's what I replaced the second half with. I'm sure it's not ideal, but it seems to work.

jQuery(function() {
  // This assumes you have a parameter in your URL called "utm_keyword"
  var utm_keyword = getUrlParams()['utm_keyword'];
  var utm_keyword = unescape(utm_keyword);
  var utm_keyword = utm_keyword.replace(/\+/g, " ");
  if (utm_keyword != undefined) {
    // This assumes you've given an element on the page and ID of "keyword"
    jQuery('#keyword').html(utm_keyword);
  }
});
</script>