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When I tried to validate the code for http://www.hyips.es (one of my freelance projects) the validator kept complaining:

cannot generate system identifier for general entity langpair.

This error is caused by the validator parsing the code inside of a <script> tag. Below are the lines which were producing the error (related to a function which translates the page from spanish to english using google translator):

<script type="text/javascript"> 
function es2eng(){
  location.href = "http://translate.google.com/translate?u=" + this.location.href + "&langpair=es|en&h1=es&ie=UTF-8"; 
}
</script>
<a href="#" onclick="es2eng();"><img style="border: medium none; margin:1px;" src="/images/banderas/england-flag.gif" alt="translate to english" height="20" width="30" /></a>

After reading a lot of confussing comments (like Try to change ‘&’ to ‘&amp;’ or to ‘%26′), and just when I was about to define the function in an external js file (not a big fan of this, because the function was only one line long…), I came to this revealing post in webmasterworld.com.

The problem can be solved as easy as this: change

<script type="text/javascript">
your script is here
</script>

To:

<script type="text/javascript">
// <![CDATA[
your script is here
// ]]>
</script>

The change stops W3C’s validator from parsing the code inside the script tags, therefore the error disappears!

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