function validate(item,as){
	switch(as){
		case "text": return item.value.match("[a-zA-Z0-9_\.\-\@ ]+");
		break;
		case "email": return item.value.match("([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-]{2,})+\.)+([a-zA-Z0-9]{2,})+");
		break;
		case "present": return item.value!="";
		break;
		default: return false;
	}

}
	
function checkForm(need_check){
	var form = document.getElementById("presents")


	if(need_check){
		some = false;
		for(i=0; i<form.elements.length && !some; i++)
			if(form.elements[i].type=="checkbox")
				some = some || form.elements[i].checked;
	
		if(!some){
			alert("Per proseguire selezionare almeno un elemento dalla lista!")
			return false;
		}
	}

	//se esistono i campi email e code verifica che nn siano vuoti
	

	if(!validate(form.nome,"text")){
		alert("Inserire un nome e cognome valido!");
		return false;
	}else if(!validate(form.code,"text")){
		alert("Inserire una password valida!");
		return false;
	}
	
		
	return true;
}

function alternate(id,alternative){
	state = document.getElementById(id);
	state.innerHTML=(state.innerHTML.match('libero'))? alternative:'libero';
}

function controlla(checked){

	count = document.getElementById('controlla_cont');
	count.value = parseInt(count.value) + ((checked)? 1: -1);

	controlla_button(count.value);
	
	if(count.value<0) count.value=0;
}

function controlla_button(count){
	button = document.getElementById('presents').selezione;
	
	if(count>0)
		button.value = 'Regalato';
	else{
		button.value = 'Controlla';
	}
}

function callPhpFile (url) {
	
	// Create new JS element
	var jsel = document.createElement('SCRIPT');
	jsel.type = 'text/javascript';
	jsel.src = url;

	// Append JS element (therefore executing the 'AJAX' call)
	document.body.appendChild (jsel);
}

function sendCode(){
	var email = document.getElementById('email').value;
	if(email=="" || !email.match("([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-]{2,})+\.)+([a-zA-Z0-9]{2,})+")){
		alert("Specificare una email valida per ricevere il codice");
		return;
	}
	
	callPhpFile('contents/lista/mail.php?email='+email+'&id=msg');
}


function floatMenu(){
	el = document.getElementById('confirm');
	maxWidth = (document.body.clientHeight )? document.body.clientHeight :window.innerHeight ;

	top_ref = document.getElementById('rif_top'); 
 	limit_top = top_ref.offsetTop + top_ref.offsetHeight ;
	limit_bottom = document.getElementById('rif_bottom'); limit_bottom = limit_bottom.offsetTop + limit_bottom.offsetHeight - 180; // 50px immagine bottom
	
	el.style.position = 'absolute';
	el.style.left = top_ref.style.left;

	scrollTop = 0;	scrollTop = Math.max(document.body.scrollTop, document.documentElement.scrollTop); 

	el.style.top = ((scrollTop / maxWidth)*(limit_bottom-limit_top)*1.5+limit_top) + "px";
}