$(function() {
	if(sessionStorage.getItem("openMenu") === null){
		sessionStorage.setItem("openMenu", "yes" );
	}
	if(sessionStorage.getItem("openMenu") == "yes"){
			$(".mainmenu").slideDown();
	}
	$("#menu-toggle").click(function() {
		$(".mainmenu").slideToggle();
			if(sessionStorage.getItem("openMenu") == "yes"){
					sessionStorage.setItem("openMenu", "no" );
				} else {
						sessionStorage.setItem("openMenu", "yes" );
				}
	});
});

$(function() {
	if(sessionStorage.getItem("openMenu") === null){
		sessionStorage.setItem("openMenu", "yes" );
	}
	if(sessionStorage.getItem("openMenu") == "yes"){
			$(".mainmenu").show();
	}
	$("#menu-toggle").click(function() {
		$(".mainmenu").slideToggle();
			if(sessionStorage.getItem("openMenu") == "yes"){
					sessionStorage.setItem("openMenu", "no" );
				} else {
						sessionStorage.setItem("openMenu", "yes" );
				}
	});
});

--- 
+++ 
@@ -3,7 +3,7 @@
 		sessionStorage.setItem("openMenu", "yes" );
 	}
 	if(sessionStorage.getItem("openMenu") == "yes"){
-			$(".mainmenu").slideDown();
+			$(".mainmenu").show();
 	}
 	$("#menu-toggle").click(function() {
 		$(".mainmenu").slideToggle();
Revert "keine slidedown animation mehr"

This reverts commit 5897ce0d7887fcdfc0df9557d8f76cac227b1301.
