function checkform() {	
	
	if (document.feedback.name.value == "") 
	{
	
	alert("Debe ingresar su nombre.");	
	return false;
	
	} else if (document.feedback.comments.value == "") 
	{
	
	alert("Debe ingresar el comentario.");	
	return false;
	
	} 
	else return true;
} 

function clickclear(thisfield, defaulttext) {
  if (thisfield.value == defaulttext) {
    thisfield.value = "";
  }
}

function clickrecall(thisfield, defaulttext) {
  if (thisfield.value == "") {
    thisfield.value = defaulttext;
  }
}

function showhide(id){
  if (document.getElementById){
    obj = document.getElementById(id);
    if (obj.style.display == "none"){
      obj.style.display = "";
    } else {
      obj.style.display = "none";
    }
  }
}