The function definition is shown below. It takes two arguments : The Id attribute value and the mode you wish to use.

<script type="text/javascript">
<!--
function toggleById(sId,sMode)
{
// This function shows/hides or toggles the
// visibility of all elements with their
// id attribute set to sId
//
// mode 0 - Hide
// mode 1 - Show
// mode 2 - Toggle
//
// http://www.mattsbits.co.uk

var element = document.getElementById(sId);

  switch (sMode) {
  case 0:
    // Hide
    element[i].style.display='none';    
    break;
  case 1:
    // Show
    element[i].style.display='block';    
    break;
  case 2:
    // Toggle
    if (element[i].style.display=='none') {
      element[i].style.display='block'; 
    } else {
      element[i].style.display='none'; 
    }  
    break;   
  }
}
//  End -->
</script>

Id values must be unique so this function only attempts to change the visibility of one element.