function changeLangue() {
    var path = document.location.href;
    var pathTraduction = path;

	if (path.indexOf('index.html') > 0) pathTraduction = 'index_en.html';
	else if (path.indexOf('index_en.html') > 0) pathTraduction = 'index.html';
	else { 
	    var pos = path.indexOf('_fr.html');
	
    	if (pos > 0) pathTraduction = path.replace('_fr.html', '_en.html');
   		 else {
    	    pos = path.indexOf('_en.html');
        	if (pos > 0) pathTraduction = path.replace('_en.html', '_fr.html');
   		 }
	}
    document.location=pathTraduction;
}