function checkValue( msg ){
	var message = document.getElementById( msg ).value;
	var regexp = new RegExp("^[_A-z0-9-\.]+(\.[_A-z0-9-]+)*@[A-z0-9-\.]+\.+[A-z0-9-]{1,}$", "g");
	
	if( msg == 'email' || msg == 'email_1' || msg == 'email_2' || msg == 'email_3' || msg == 'email_4'){
		if( !regexp.test( message ) ){
			document.images[ 'img_' + msg ].src = "images/false.jpg";
		} else {
			document.images[ 'img_' + msg ].src = "images/true.jpg";
		}
	} else {
		if( message.length == 0){
			document.images[ 'img_' + msg ].src = "images/false.jpg";
	 	} else {
			document.images[ 'img_' + msg ].src = "images/true.jpg";
		}
	}
}

function checkAllForm(){
	checkValue( 'firstname' );
	checkValue( 'lastname' );
	checkValue( 'email' );
}

function checkAllFriends(){
	for(var i=1; i < 5; i++){
		if( document.getElementById('firstname_'+i).value != "" || document.getElementById('lastname_'+i).value != "" || document.getElementById('email_'+i).value != ""){
			checkValue( 'firstname_'+i );
			checkValue( 'lastname_'+i );
			checkValue( 'email_'+i );
		}
	}
}

function checkAllfriends(){
	
}

function txtDisplayer( txt, cible){
	document.getElementById(cible).innerHTML = txt;
}

function changePreview(id){
	var currentImg = document.getElementById('behind_preview');
	currentImg.src = 'images/btn_' + id + '_big.jpg';
}

var gShop = 1;

window.onload = function reset(){
	if( document.getElementById('bg_'+gShop)){
		document.getElementById('bg_'+gShop).style.background = "#1b1b1b";
	}
}

function activateShops(id){
	var cShop = document.getElementById('shop_'+id);
	var oldShop = document.getElementById('shop_'+gShop);
	var bg1 = document.getElementById('bg_'+id);
	var bg2 = document.getElementById('bg_'+gShop);
	if( id != gShop){
		cShop.style.display = 'block';
		oldShop.style.display = 'none';
		bg1.style.background = "#1b1b1b";
		bg2.style.background = '';
		gShop = id;
	}
}