function validate_required(field,alerttxt){
	with (field){
		if (value==null||value=="")
		  {alert(alerttxt);return false;}
		else {return true}
	}
}
	
function validate_interest_form(thisform){
	with (thisform) {
	if (validate_required(email,"Please, fill Email field")==false)
	  {email.focus();return false;}
	
	if (isValidEmail(email,"Email address has not a valid form")==false)
	  {email.focus();return false;}
	
	if (validate_required(country,"Please, fill Country field")==false)
	  {country.focus();return false;}
	}

}


function isValidEmail(field,alerttxt) {
	var emailRegex = /^([\w]+)(.[\w]+)*@([\w]+)(.[\w]{2,3}){1,2}$/;
	emailRegex = new RegExp(emailRegex); 
	with (field){
		if (emailRegex.test(value) != true)
		  {alert(alerttxt);return false;}
		else {return true}
	}
}