var page = '';

window.onload = function () {
	document.getElementById('lien_acceuil').onmouseover = function (){
		document.getElementById('lien_acceuil').src = 'images/nav_accueil_on.jpg';
	}
	document.getElementById('lien_acceuil').onmouseout = function (){
		if (page != 'accueil' ) {
			document.getElementById('lien_acceuil').src = 'images/nav_accueil_off.jpg';
		}
	}
	document.getElementById('lien_activite').onmouseover = function (){
		document.getElementById('lien_activite').src = 'images/nav_activites_on.jpg';
	}
	document.getElementById('lien_activite').onmouseout = function (){
		if (page != 'activites' ) {
			document.getElementById('lien_activite').src = 'images/nav_activites_off.jpg';
		}
	}
	document.getElementById('lien_prog').onmouseover = function (){
		document.getElementById('lien_prog').src = 'images/nav_programme_on.jpg';
	}
	document.getElementById('lien_prog').onmouseout = function (){
		if (page != 'programme' ) {
			document.getElementById('lien_prog').src = 'images/nav_programme_off.jpg';
		}
	}
	document.getElementById('lien_contact').onmouseover = function (){
		document.getElementById('lien_contact').src = 'images/nav_contact_on.jpg';
	}
	document.getElementById('lien_contact').onmouseout = function (){
		if (page != 'contact' ) {
			document.getElementById('lien_contact').src = 'images/nav_contact_off.jpg';
		}
	}
}