function clear(){
	//an empty function that avoid that focus stay on menus and create some problem when back is used in browser
}

function hover(obj)
{
	UL = obj.getElementsByTagName('ul');
	if(UL.length > 0){
		sousMenu = UL[0].style;	 
		if(sousMenu.display == 'none' || sousMenu.display == ''){
			sousMenu.display = 'block';
		}
		else{
			sousMenu.display = 'none';
		}
	}
	return false;
}