function mostrarDiv(Id)
{
 document.getElementById(Id).style.display = 'block';
}

function esconderDiv(Id)
{
 document.getElementById(Id).style.display = 'none';
}

function CleanFeedbackMessage( searchClass, tagName) {

var tags = document.getElementsByTagName(tagName);

for(i=0,j=0; i<tags.length; i++) {
 var test = tags[i].className;
 if (test == searchClass){
  tags[i].innerHTML = "";
 }
} 
}