window.onload = addFormEvent;

function addFormEvent(func) {
  if (!document.getElementById | !document.getElementsByTagName) return
  var oldonload=window.onload
  if (typeof window.onload != 'function') { window.onload=func }
  else {
    window.onload=function() { oldonload(); func() }
  }
}

function replaceContents(id,content){
  document.getElementById(id).innerHTML = content
}


function replaceLinkGB(){
 if (document.getElementById) replaceContents('guest'  , ' <a href="guest/2851_index.php"><img src="../images/your-say/guest-book.jpg" alt="" class="floatLeft" />Guest Book</a>') 
}


addFormEvent(replaceLinkGB)