function trim(lstrcadena) 
{
  // quito primero los posibles caracteres vacíos al principio
  if (lstrcadena.length != 0)
  {		
    while (lstrcadena.charAt(0) == " ")
    {
      lstrcadena = lstrcadena.substr(1);		
    }
  }	
  // Ya ahora los últimos
  if (lstrcadena.length != 0)
  {		
    while (lstrcadena.charAt(lstrcadena.length-1) == " ")
    {
      lstrcadena = lstrcadena.substr(0,lstrcadena.length-1);		
    }
  }	

  return lstrcadena;  
}

function enviaraunamigo(url)
{
	var sizer = window.open("enviaraunamigo.asp?url="+url,"","left=50,top=50,width=300,height=375,scrollbars=no,menubar=no,toolbar=no,statusbar=no");
}

function esEmail( elinput )
{
      var email = elinput.value;
      if ( email.indexOf("@") < 1 )
      {
         return false;
      }

      if ( email.substr(email.indexOf("@")).indexOf(".") < 1 )
      {
         return false;
      }
      return true;
}
function comentario(url)
{
	var sizer = window.open(url,"","left=50,top=50,width=300,height=425,scrollbars=no,menubar=no,toolbar=no,statusbar=no");
}