// JavaScript Document
function validar(form){
	
 
 if (!/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(form.email.value)){
    alert("Please write a valid email.")
    form.email.focus();
    return false; 
 }

 
 var x=form;
 for (var i=0;i<x.length;i++)
  {  
  	if (x.elements[i].type == "text" && x.elements[i].value == "") 
	{				
			switch (x.elements[i].name)
			{
				case "email": case "nombre":
					alert("This field can not be empty");
		   			x.elements[i].focus();
   					return false;
					break;				
				default:
					break;
			}		
 	}	
  }
  if (form.comentarios.value == "")
	{
		alert("This field can not be empty");
		form.comentarios.focus();
		return false;
	}
  
  return true;
}