function submit_page_s(form) {
        var foundError = false;
        if(isFieldBlank_s(form.tunombre)) {
	        alert("Por favor:\nIngresa tu nombre");
			form.tunombre.focus();
            foundError = true;
        }else
        if(isFieldBlank_s(form.tucorreo)) {
	        alert("Por favor:\nIngresa tu correo electrónico");
			form.tucorreo.focus();
            foundError = true;
        }else
        if(!foundError && !isValidEmail_s(form.tucorreo)) {
            alert("La direccion EMAIL no es valida");
			form.tucorreo.focus();
            foundError = true;
        }else
        if(isFieldBlank_s(form.paraemail)) {
	        alert("Por favor:\nIngresa el correo para el destinatario");
			form.paraemail.focus();
            foundError = true;
        }else
        if(!foundError && !isValidEmail_s(form.paraemail)) {
            alert("La(s) dirección(es) EMAIL no es(son) valida(s)");
			form.paraemail.focus();
            foundError = true;
        }						
        if(!foundError) {
          form.submit();
        }
    }

    function isFieldBlank_s(theField) {
        if(theField.value.length == 0)
            return true;
        else
            return false;
    }
    function isValidEmail_s(theField) {
        var foundSymbol = false;

        for(var i=0; i<theField.value.length; i++) {
            var ch = theField.value.substring(i,i+1)
            if (ch == "@")
                foundSymbol=true;
        }
    
        return foundSymbol;
    }
function validaenviarpagina()
{
var Valido  = true

  if(!submit_page_s(document.forms.form) )
  {
  Valido = false;
  }
  else{
	document.forms['form'].submit()
	WinOpen() 
	} 
return Valido
}