function correctPNG() // correctly handle PNG transparency in Win IE 5.5 or higher.
{
for(var i=0; i<document.images.length; i++)
{
var img = document.images[i]
var imgName = img.src.toUpperCase()
if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
{
var imgID = (img.id) ? "id='" + img.id + "' " : ""
var imgClass = (img.className) ? "class='" + img.className + "' " : ""
var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
var imgStyle = "display:inline-block;" + img.style.cssText 
var imgAttribs = img.attributes;
for (var j=0; j<imgAttribs.length; j++)
{
var imgAttrib = imgAttribs[j];
if (imgAttrib.nodeName == "align")
{                  
if (imgAttrib.nodeValue == "left") imgStyle = "float:left;" + imgStyle
if (imgAttrib.nodeValue == "right") imgStyle = "float:right;" + imgStyle
break
 }
 }
var strNewHTML = "<span " + imgID + imgClass + imgTitle
strNewHTML += " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
strNewHTML += "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
strNewHTML += "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>" 
img.outerHTML = strNewHTML
i = i-1
}
}
}
window.attachEvent("onload", correctPNG);

<!--// *show-hide*/
function getElement(id) {
return document.getElementById ? document.getElementById(id) :
document.all ? document.all(id) :
document.layers ? document.layers[id] : null;
}

function hide() {
for (var el, a=0; arguments[a]; ++a) {
el = getElement(arguments[a]);
if (el) {
if (el.style) el.style.visibility = 'hidden';
else if (typeof el.visibility != 'undefined') el.visibility = 'hide';
}
}
}

function show() {
for (var el, a=0; arguments[a]; ++a) {
el = getElement(arguments[a]);
if (el) {
if (el.style) el.style.visibility = 'visible';
else if (typeof el.visibility != 'undefined') el.visibility = 'show';
}
}
}
//-->

function enviarmail()
{
mail_str = "mailto:?subject= Recomendar web " + document.title;
mail_str += "&body= Te recomiendo que visites este restaurante (tu dominio) -- " + document.title;

mail_str += ". La puedes encontrar en esta URL:, " + location.href; 

location.href = mail_str;
}
<!--
//-->
function toTop(id){
document.getElementById(id).scrollTop=0
}

defaultStep=1
step=defaultStep
function scrollDivDown(id){
document.getElementById(id).scrollTop+=step
timerDown=setTimeout("scrollDivDown('"+id+"')",20)
}

function scrollDivUp(id){
document.getElementById(id).scrollTop-=step
timerUp=setTimeout("scrollDivUp('"+id+"')",20)
}
<!-- imagenes
function showPic (whichpic) {
if (document.getElementById) {
document.getElementById('placeholder').src = whichpic.href;
    return false;
 } else {
  return true;
 }
}
// -->
function abreventana(propiedades){
 ventana = window.open(this.href,"zoom",propiedades);
 if (window.focus) ventana.focus(); 

  return false;
}