function validateSubmit(abutton){
var inputs=submitter.getElementsByTagName('INPUT');
var ok=true;
for (var i=0;i<inputs.length;i++){
if (inputs.item(i).getAttribute('type')=='text'){
   inputs.item(i).style.backgroundColor='#FFFFFF';
   if(!inputs.item(i).getAttribute("readonly"))
      if (inputs.item(i).getAttribute("required"))
         if (inputs.item(i).value==''){
            ok=false;
            inputs.item(i).style.backgroundColor='#FF0000';
	    }
        }
     }
if (!ok){
  alert('Por favor ingrese los campos requeridos (marcados con rojo)');
 if (abutton)
  abutton.disabled=false;
 abutton.value='Enviar';
}
else
submitter.submit();
}
function isMail(_email) {
     var emailReg = /^[a-z][a-z-_0-9\.]+@[a-z-_=>0-9\.]+\.[a-z]{2,3}$/i
	var resp = true;
	if(_email != ""){
       resp =  emailReg.test(_email);
	  if(!resp){
	     alert("ingrese un email válido");
	  }
	}
   return resp;
}