function resize(id, width, height, margins) {
	document.getElementById(id).width=width;
	document.getElementById(id).height=height;
	document.getElementById(id).style.margin=margins;
}

function ajust_links(choice) {

	switch (choice)
	{
		case '1':
			document.getElementById('Canada').style.visibility="visible";
			document.getElementById('Egypte').style.visibility="hidden";
			document.getElementById('France').style.visibility="hidden";
			document.getElementById('Liban').style.visibility="hidden";
			document.getElementById('UAE').style.visibility="hidden";
			break;
		case '2':
			document.getElementById('Canada').style.visibility="hidden";
			document.getElementById('Egypte').style.visibility="visible";
			document.getElementById('France').style.visibility="hidden";
			document.getElementById('Liban').style.visibility="hidden";
			document.getElementById('UAE').style.visibility="hidden";
			break;
		case '3':
			document.getElementById('Canada').style.visibility="hidden";
			document.getElementById('Egypte').style.visibility="hidden";
			document.getElementById('France').style.visibility="visible";
			document.getElementById('Liban').style.visibility="hidden";
			document.getElementById('UAE').style.visibility="hidden";
			break;
		case '4':
			document.getElementById('Canada').style.visibility="hidden";
			document.getElementById('Egypte').style.visibility="hidden";
			document.getElementById('France').style.visibility="hidden";
			document.getElementById('Liban').style.visibility="visible";
			document.getElementById('UAE').style.visibility="hidden";
			break;
		case '5':
			document.getElementById('Canada').style.visibility="hidden";
			document.getElementById('Egypte').style.visibility="hidden";
			document.getElementById('France').style.visibility="hidden";
			document.getElementById('Liban').style.visibility="hidden";
			document.getElementById('UAE').style.visibility="visible";
			break;
		default:
			break;
	}
}

function change_destinantion(url) {
	document.getElementById('destination').value=url;			
}

function redirect() {
	url = document.getElementById('destination').value;
	if(url != '')
		window.open(url);
}

function validateEntries(form_id, email, author, comment) {
	var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
	var address = document.forms[form_id].elements[email].value;
	var name = document.getElementById('author').value;
	var commentary = document.getElementById('comment').value;
	
	if(reg.test(address) == false) {
      alert('l\'addresse courriel n\'est pas valide');
      return false;
   }else if(name.length == 0){
		alert('veillez entrer votre nom, svp');
		return false;
	}else if(commentary.length == 0){
		alert('veillez entrer un commentaire, svp');
		return false;
	}
}