function showHide(menu, action, tab, open) {
	var obj, tabstyle;
	obj = window.document.getElementById(menu);
	obj = obj.style;
	obj.visibility = (action=='show') ? 'visible' : 'hidden';
	tabstyle = window.document.getElementById(tab);
	if(action == 'show')
		tabstyle.style.backgroundColor = 'rgb(255, 255, 255)';
	else if(action == 'hide') {
		if(tab == 'menu1' && open == 'accueil')
			tabstyle.style.backgroundColor = 'rgb(220, 220, 220)';
		else if(tab == 'menu2' && open == 'europe')
			tabstyle.style.backgroundColor = 'rgb(220, 220, 220)';
		else if(tab == 'menu3' && open == 'afe')
			tabstyle.style.backgroundColor = 'rgb(220, 220, 220)';
		else if(tab == 'menu4' && open == 'regates')
			tabstyle.style.backgroundColor = 'rgb(220, 220, 220)';
		else if(tab == 'menu5' && open == 'photos')
			tabstyle.style.backgroundColor = 'rgb(220, 220, 220)';
		else if(tab == 'menu6' && open == 'administratif')
			tabstyle.style.backgroundColor = 'rgb(220, 220, 220)';
		else
			tabstyle.style.backgroundColor = 'rgb(235, 235, 235)';
	}
}