function add_bookmark() {
	var browsName = navigator.appName;
	if (browsName == "Microsoft Internet Explorer") {
		window.external.AddFavorite('http://www.quenena.com/','QueNena.com, Sitio para la diversion de los niņos, con informacion para padres y maestros');
	} else
		if (browsName == "Netscape") {
			alert ("\nPara agregar esta pgina a tu BookMark presiona CTRL+D");
		}
}

ie=false;
ns=false;
if(document.all)ie=true;
if(document.layers)ns=true;

function contactanos(){
 window.open('http://www.clickaqui.com/contactanos.asp?sitio=quenena','pollwin','toolbar=no,scrollbars=no,directories=no, status=no,menubar=no,resizable=no,width=582,height=500');
}

function anunciate(){
window.open("http://www.sugerimos.com/coti.asp","pollwin","toolbar=no,scrollbars=yes,directories=no, status=no,menubar=no,resizable=no,width=583,height=515")
}
<!-- 
//Disable right click script III- By Renigade (renigade@mediaone.net) 
//For full source code, visit http://www.dynamicdrive.com 
var message="Lo siento, no click derecho"; 
/////////////////////////////////// 
function clickIE() {if (document.all) {(message);return false;}} 
function clickNS(e) {if 
(document.layers||(document.getElementById&&!document.all)) { 
if (e.which==2||e.which==3) {(message);return false;}}} 
if (document.layers) 
{document.captureEvents(Event.MOUSEDOWN);document.onmousedown=clickNS;} 
else{document.onmouseup=clickNS;document.oncontextmenu=clickIE;} 
document.oncontextmenu=new Function("return false") 
// --> 
function emailCheck (emailStr) {
	var emailPat=/^(.+)@(.+)$/;
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]";
	var validChars="\[^\\s" + specialChars + "\]";
	var quotedUser="(\"[^\"]*\")";
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom=validChars + '+';
	var word="(" + atom + "|" + quotedUser + ")";
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	var matchArray=emailStr.match(emailPat);
	if (matchArray==null) {
	 alert("Tu direccion de email es incorrecta (revisa las @ y .'s)");
	 return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];
	if (user.match(userPat)==null) {
	 alert("El username no es valido");
	 return false;
	}
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
	  for (var i=1;i<=4;i++) {
	  if (IPArray[i]>255) {
	  alert("El IP no es valido");
	  return false;
	  }
	 }
	 return true;
}
var domainArray=domain.match(domainPat);
if (domainArray==null) {
 alert("El nombre de dominio no es valido.");
 return false;
}
var atomPat=new RegExp(atom,"g");
var domArr=domain.match(atomPat);
var len=domArr.length;
if (domArr[domArr.length-1].length<2 || domArr[domArr.length-1].length>4) {
  alert("La direccion debe terminar con un dominio de cuatro letras o un pais de dos.");
 return false;
}
if (len<2) {
 var errStr="Falta el hostname!";
 alert(errStr);
 return false;
}
var doms= Array("hotmail.com.mx","hotamil.com" ,"hotmai.com","hotmail.com.", "homail.com" ,"hotmil.com" ,"hotmail.com.pe" ,"htomail.com","hotmail.co" ,"hotmial.com" ,"hotmail .com" ,"@." ,"htmail.com","hormail.com" ,"latinamail.com" ,"latinamil.com" ,"hot mail.com","hormail.com" ,"holmail.com" ,"hotmail.com.com" ,".com.com" ,"hotmail.cm",".comm" ,"hotmail." ,"hot");
var splited=emailStr.split('@');
var dom=splited[1];
var test=true;
for (i=0; i<doms.length; i++)
{
  test=(test && !(doms[i]==dom));
}
if (!test) 
{ 
  alert('Por favor revise que su dominio este bien escrito');
  return false;
}
return true;
}



function recomanda(){
    if (document.reco1.email.value.length < 7 || document.reco1.email.value == 'Tu Email'){
   	  document.reco1.email.focus();
	  alert('Ingresa tu email correctamente');
	  return false;
	}
    if (!emailCheck(document.reco1.email.value)){
	    document.reco1.email.focus();
		return false;
	}

    if (document.reco1.email2.value.length < 7 || document.reco1.email2.value == 'Email de Tu Amigo 1'){
   	  document.reco1.email2.focus();
	  alert('Ingresa el email de tu amigo correctamente');
	  return false;
	}
    if (!emailCheck(document.reco1.email2.value)){
	    document.reco1.email2.focus();
		return false;
	}
	
	if (document.reco1.email3.value != 'Email de tu amigo 2'){		
      if (!emailCheck(document.reco1.email3.value)){
	      document.reco1.email3.focus();
		  return false;
	  }
	}
	if (document.reco1.email4.value != 'Email de tu amigo 3'){
      if (!emailCheck(document.reco1.email4.value)){
	      document.reco1.email4.focus();
		  return false;
	  }
	}	
}