title: Need drop-downs option value in form action query-string
body: <p>I am working in PHP + HTML</p>
  
  <p>I have a form with the action defined like so:</p>
  
  <p>1] Form action="index.php?option=com_advertisment&amp;task=keysearch&amp;Itemid=2&amp;catid=this.options[this.selectedIndex].value" </p>
  
  <p>but the selected value of drop down is not shown in query string when I submit the form.</p>
  
  <p>That means <code>this.options[this.selectedIndex].value</code> is not replace by <code>value</code> but comes as it is in query string like this:</p>
  
  <blockquote>
    <p>http://mydemoserver.com/index.php?option=com_advertisment&amp;task=keysearch&amp;Itemid=2&amp;catid=this.options[this.selectedIndex].value</p>
  </blockquote>
  
  <p>If any one know the solution please help me.</p>
  
  <p>Thanks</p>