var errorsOnSubmit = function(form){
	
	var ret = Spry.Widget.Form.validate(form);
	var errorZone= document.getElementById('error_zone');
	
	var authorTip= document.getElementById('authorTip');
	authorTip.style.visibility = 'visible';
	
	var  emailTip= document.getElementById('emailTip');
	emailTip.style.visibility = 'visible';
	
	if (!ret){
		errorZone.style.visibility = 'visible';
		errorZone.style.backgroundColor = 'white';
	}else{
		errorZone.style.visibility = 'hidden';
	}
	return ret;
}
var hide = function(name){
	var zone= document.getElementById(name);
	zone.style.visibility = 'hidden';
}