var isNS4 = (navigator.appName=="Netscape")?1:0;

function abreSitio(){
var URL = "http://";
var web = document.form1.sitio.options[document.form1.sitio.selectedIndex].value;
window.open(URL+web, '_self', '');
}


   function validacion2(formulario) {  
     
       var er_ewall = /(^([a-z]|[A-Z]|-)+|^)$/  
             
      //comprueba campo del blog
       if(!er_ewall.test(formulario.ewall.value)) {   
           alert('Blog name: invalid character.')  
           return false  
       } }