diff --git a/ChangeLog b/ChangeLog
index 3b31c28..9f3e370 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+2021-01-15:
+- web interface for block assignemt seems ready
+
 2020-12-05:
 - locomotive fixed division by zero
 - webinterface: speed 0 was not displayed corecctly in ctrl screen.
diff --git a/webinterface/block.js b/webinterface/block.js
index f804970..36af14d 100644
--- a/webinterface/block.js
+++ b/webinterface/block.js
@@ -47,54 +47,78 @@ function block_Delete(name) {
 
 
 function block_contextmenu(name) {
-	gContextmenuCreate(name);
+    let innerhtml = "";
 
-	gContextmenuAdd("Locomotives", 0, 0);
+    innerhtml = "<center><label><select id=\"contextbox_loc\">";
+    innerhtml += "<option value=\"\"></option>";
 	for (var i = 0; i < locomotives.length; i++) {
 		if (locomotives[i].name) 
-			gContextmenuAdd(locomotives[i].name, block_ctxmenu_LocoSelect, locomotives[i].name);
+			innerhtml += "<option value=\""+locomotives[i].name+"\">"+locomotives[i].name+"</option>";
 	}
-	gContextmenuAdd("", 0, 0);
-	gContextmenuAdd("Set DestinationFWD", block_ctxmenu_LocoDestinationFWD, 0);
-	gContextmenuAdd("Set DestinationREV", block_ctxmenu_LocoDestinationREV, 0);
-	gContextmenuAdd("", 0, 0);
-	gContextmenuAdd("AssignFWD", block_ctxmenu_LocoAssignFWD, 0);
-	gContextmenuAdd("AssignREV", block_ctxmenu_LocoAssignREV, 0);
-	gContextmenuAdd("", 0, 0);
-	gContextmenuAdd("Clear", block_ctxmenu_Clear, 0);
-	gContextmenuAdd("Offservice", block_ctxmenu_Clear, 1);
+    innerhtml += "</select></label><br>";
+    innerhtml += "<button id=\"contextbox_AsgnLD\" type=\"button\">Assign &lArr;&dArr;</button><br>";
+    innerhtml += "<button id=\"contextbox_AsgnRU\" type=\"button\">Assign &rArr;&uArr;</button><br>";
+    innerhtml += "<button id=\"contextbox_SetDLD\" type=\"button\">Go &lArr;&dArr;</button><br>";
+    innerhtml += "<button id=\"contextbox_SetDRU\" type=\"button\">Go &rArr;&uArr;</button><hr>";
+    innerhtml += "<button id=\"contextbox_Clear\" type=\"button\">Clear</button><br>";
+    innerhtml += "<button id=\"contextbox_Off\" type=\"button\">Off</button><hr>";
+    innerhtml += "<button id=\"contextbox_Close\" type=\"button\">Close</button></center>";
+
+	gContextmenuCreate(name, innerhtml);
+
+	gAddEventListener("contextbox_AsgnLD", 'click', block_ctxmenu_AssignLD);
+	gAddEventListener("contextbox_AsgnRU", 'click', block_ctxmenu_AssignRU);
+	gAddEventListener("contextbox_SetDLD", 'click', block_ctxmenu_DestinationLD);
+	gAddEventListener("contextbox_SetDRU", 'click', block_ctxmenu_DestinationRU);
+	gAddEventListener("contextbox_Clear", 'click', block_ctxmenu_Clear);
+	gAddEventListener("contextbox_Off", 'click', block_ctxmenu_Off);
+	gAddEventListener("contextbox_Close", 'click', gContextmenuClose);
 };
 
 
-function block_ctxmenu_LocoSelect (element, value) {
-	alert ("LocoSelect:" + value);
-};
-
-
-function block_ctxmenu_LocoDestinationFWD (element, value) {
-	alert ("DestinationFWD:" + value);
+function block_ctxmenu_DestinationLD (element, value) {
+	let loc = document.getElementById("contextbox_loc");
+	if (loc) {
+    	locomotive_server_Dest(loc.value, element.name, 1);
+	}
 };
 
 
-function block_ctxmenu_LocoDestinationREV (element, value) {
-	alert ("DestinationREV:" + value);
+function block_ctxmenu_DestinationRU (element, value) {
+	let loc = document.getElementById("contextbox_loc");
+	if (loc) {
+    	locomotive_server_Dest(loc.value, element.name, 0);
+	}
+	gContextmenuClose();
 };
 
 
-function block_ctxmenu_LocoAssignFWD (element, value) {
-	alert ("AssignFWD:" + value);
+function block_ctxmenu_AssignLD (element, value) {
+	let loc = document.getElementById("contextbox_loc");
+	if (loc) {
+    	locomotive_server_Assign(loc.value, element.name, 1);
+	}
+	gContextmenuClose();
 };
 
 
-function block_ctxmenu_LocoAssignREV (element, value) {
-	alert ("AssignREV:" + value);
+function block_ctxmenu_AssignRU (element, value) {
+	let loc = document.getElementById("contextbox_loc");
+	if (loc) {
+    	locomotive_server_Assign(loc.value, element.name, 0);
+	}
+	gContextmenuClose();
 };
 
 
 function block_ctxmenu_Clear (element, value) {
-	// value == 0 ... clear
-	// value == 1 ... Put Off Service
-	alert ("Clear / Off Service");
+   	block_server_Clear(element.name);
+	gContextmenuClose();
+}
+
+function block_ctxmenu_Off (element, value) {
+   	block_server_Off(element.name);
+	gContextmenuClose();
 }
 
 
@@ -116,6 +140,23 @@ function block_server_Del(elm) {
 };
 
 
+//
+// send clear block
+//
+function block_server_Clear(blockname) {
+	var request = { command: "blockclear", block: blockname };
+	serverinout (request, serverinout_defaultCallback);
+};
+
+
+//
+// send put block off service
+//
+function block_server_Off(blockname) {
+	var request = { command: "blockoff", block: blockname };
+	serverinout (request, serverinout_defaultCallback);
+};
+
 
 function blockdetail_show(name) {
 	var win = document.getElementById("blockdetail");
diff --git a/webinterface/gui/gui.css b/webinterface/gui/gui.css
index 2d4b2e4..e3be78b 100644
--- a/webinterface/gui/gui.css
+++ b/webinterface/gui/gui.css
@@ -68,7 +68,8 @@
 
 .GUIcontextmenuClient {
   overflow: auto;
-  padding: 0px;
+  padding: 2px;
+  margin: 0px;
   background-color: var(--contextmenu-bg-color);
   color: var(--contextmenu-fg-color);
   text-size: small;
diff --git a/webinterface/gui/gui.js b/webinterface/gui/gui.js
index 0148952..06c32ca 100644
--- a/webinterface/gui/gui.js
+++ b/webinterface/gui/gui.js
@@ -58,7 +58,7 @@ function getTextBetween(fulltext, text1, text2) {
 
 //
 // Context Menus
-function gContextmenuCreate(title) {
+function gContextmenuCreate(title, clientInnerHTML) {
 	let cm = document.getElementById("ContextMenu");
 	if (cm) {
 		let parent = cm.parentNode;
@@ -72,16 +72,11 @@ function gContextmenuCreate(title) {
 	head.setAttribute("class", "GUIcontextmenuHead");
 	head.innerHTML = title;
 
-	var ul = document.createElement("ul");
-	ul.setAttribute("id", "ContextMenuElements");
-	ul.setAttribute("class", "GUIcontextmenuElements");
-
 	var client = document.createElement("div");
 	client.setAttribute("id", "ContextMenuClient");
 	client.setAttribute("class", "GUIcontextmenuClient");
 	client.setAttribute("style", "max-height: 400px; max-width:150px;");
-	client.innerHTML = "";
-	client.appendChild (ul);
+	client.innerHTML = clientInnerHTML;
 
 	cm = document.createElement("div");
 	cm.setAttribute("id", "ContextMenu");
@@ -96,28 +91,6 @@ function gContextmenuCreate(title) {
 	return cm;
 };
 
-
-function gContextmenuAdd(text, callback_function, value) {
-	let ul = document.getElementById("ContextMenuElements");
-
-    if (ul)	{
-    	let li = document.createElement("li");
-    
-    	li.innerHTML = text;
-        li.value = value;
-        if (typeof callback_function === 'object' && callback_function !== null) {
-            li.addEventListener("click", callback_function);
-            debug ("add event listener.");
-        }
-        else {
-        	debug ("add event listener.");
-        }
-
-        ul.appendChild(li);
-    }
-};
-
-
 function gContextmenuClose() {
 	let cm = document.getElementById("ContextMenu");
 	if (cm) {
diff --git a/webinterface/locomotive.js b/webinterface/locomotive.js
index e85a44a..7869b99 100644
--- a/webinterface/locomotive.js
+++ b/webinterface/locomotive.js
@@ -88,6 +88,28 @@ function locomotive_server_Del(elm) {
 };
 
 
+//
+// send locomotive assignment to server (is blockname is empty clear assignment)
+//
+function locomotive_server_Assign(locname, blockname, reverse) {
+	var request = { command: "locomotiveassign", locomotive: locname, block: blockname, reverse: reverse };
+	serverinout (request, serverinout_defaultCallback);
+};
+
+
+//
+// set locomotive destination to server (is blockname is empty clear assignment)
+//
+function locomotive_server_Dest(locname, blockname, reverse) {
+	var request = { command: "locomotivedestination", locomotive: locname, block: blockname, reverse: reverse };
+	serverinout (request, serverinout_defaultCallback);
+};
+
+
+
+
+
+
 //
 // send delete element to server
 //