var store = false, catalog = false;
function dropdown(menu, whichone){
	var menus = document.getElementsByClassName("submenu");
	for(var i=0; i<menus.length; i++){
		menus[i].style.height = "0px";
	}
	if (whichone=="store" && !store) {
		menu.getElementsByTagName("ul")[0].style.height = "235px";
		store = true; catalog = false;
	}else if (whichone=="catalog" && !catalog) {
		menu.getElementsByTagName("ul")[0].style.height = "525px";
		catalog = true; store = false;
	}else {
		store = false; catalog = false;
	}
}