function show_main(selection)
		{
		div = document.getElementById(edition); div.style.display = 'none';
		div = document.getElementById(selection); div.style.display = 'block';
		edition = selection;
		}
	
	function change_main(selection)
		{
		document.getElementById('main').innerHTML = document.getElementById(selection).innerHTML; 
		div = document.getElementById("main"); div.style.display = 'block';
		}
		
	function show_alert(message, close)
		{
		if(close == 0){close_button="";} else {close_button='<button TYPE="button" onClick="mask_alert()" >Close</button>'}
		document.getElementById('alert').innerHTML = '<H1>Message</H1>' + message + close_button; 
		div = document.getElementById("alert"); div.style.display = 'block';
		}
		
	function mask_alert()
		{
		document.getElementById('alert').innerHTML = ""; 
		div = document.getElementById("alert"); div.style.display = 'none';
		}			
	
	function fill_div(target, selection)
		{
		document.getElementById(target).innerHTML = selection; 
		}
		
	function valide_email(email)				/* Verify email*/
		{
	     var modele = /^[a-zA-Z0-9\.\-_]+@[a-zA-Z0-9\.\-_]+\.[a-zA-Z]{2,5}$/i;
	     if (modele.test(email))
	        { msg = "";  } else {msg = "Provided email is not valid !";  }		 
	         return msg;
	     }
	       		
	function verif_msg(form)				/* Verify if form is correctly filled*/
		{
		msg = "";
		if(form.name.value == "")  					msg = msg + "- your name<br>";
		if(form.email.value == "")  				msg = msg + "- your email<br>";
		if(form.subject.value == "")  				msg = msg + "- a subject<br>";
		if(form.message.value == "")  				msg = msg + "- a message<br>";
		if(msg == "") 						
			{msg = msg + valide_email(form.email.value);}
		else
			{msg = "Please provide<br>" + msg;}
		if(msg == "")  					
			{
			msg = 'Processing... <img src="images/loader.gif" \/>';
			show_alert(msg, 0);
			form.submit(); } 
		else { show_alert(msg, 1);}
		}
		
	function stopUpload(success)
		{
		var result = '';
		if (success == 3) { msg = 'Your message was send successfully!<br />Your file is uploaded<br />It will be treated shortly'; }
		if (success == 2) { msg = 'Your message was send successfully!<br /><br />It will be treated shortly'; }
		if (success == 0) { msg = 'There was an error during message processing! Please try again'; }
		show_alert(msg, 1);
      	return true;   
		}
//-->


// allow to submit form by changing a select option

	function select_and_go (select_box, options) 
		{
		if (select_box.value.length > 0)  location.href =  "index<?= $page_id; ?>-"+ select_box.name + "-" + select_box.value + options +  ".html";
		}