Index: source/blender/blenkernel/intern/ipo.c
===================================================================
--- source/blender/blenkernel/intern/ipo.c	(revision 10983)
+++ source/blender/blenkernel/intern/ipo.c	(working copy)
@@ -997,7 +997,7 @@
 	if(ipo==NULL) return;
 	
 	for(icu= ipo->curve.first; icu; icu= icu->next) {
-		if(icu->driver || (icu->flag & IPO_LOCK)==0) 
+		if((icu->driver || (icu->flag & IPO_LOCK)==0) && ipo->muteipo==0) 
 			calc_icu(icu, ctime);
 	}
 }
Index: source/blender/makesdna/DNA_ipo_types.h
===================================================================
--- source/blender/makesdna/DNA_ipo_types.h	(revision 10983)
+++ source/blender/makesdna/DNA_ipo_types.h	(working copy)
@@ -44,8 +44,8 @@
 	
 	ListBase curve;
 	rctf cur;
-	short blocktype, showkey;
-	int pad;
+	short blocktype, showkey, muteipo;
+	short pad;
 		
 } Ipo;
 
Index: source/blender/src/header_ipo.c
===================================================================
--- source/blender/src/header_ipo.c	(revision 10983)
+++ source/blender/src/header_ipo.c	(working copy)
@@ -1156,6 +1156,7 @@
 {
 	Object *ob;
 	EditIpo *ei;
+	Ipo *ipo;
 	uiBlock *block;
 	short xco,xmax;
 	char naam[20];
@@ -1225,6 +1226,7 @@
 	uiBlockSetEmboss(block, UI_EMBOSS);
 
 	ob= OBACT;
+	ipo= ob->ipo;
 	
 	/* action switch option, only when active object is there and no pin */
 	uiSetButLock(G.sipo->pin, "Can't change because of pinned data");
@@ -1316,8 +1318,15 @@
 	xco= std_libbuttons(block, (short)(xco+1.5*XIC), 0, allow_pin, &G.sipo->pin, B_IPOBROWSE, ID_IP, 
 						G.sipo->blocktype, (ID*)G.sipo->ipo, G.sipo->from, &(G.sipo->menunr), B_IPOALONE, B_IPOLOCAL, B_IPODELETE, 0, B_KEEPDATA);
 
+	/* Mute IPOs */
+	if(ipo) {
+		uiBlockBeginAlign(block);
+		uiDefIconButS(block, ICONTOG, 1, ICON_RESTRICT_VIEW_OFF,	xco+=XIC,0,XIC,YIC, &(ipo->muteipo), 0, 0, 0, 0, "Mute IPOs");
+		uiBlockEndAlign(block);
+	}
+
 	/* COPY PASTE */
-	xco-= XIC/2;
+	xco+= XIC/2;
 	uiBlockBeginAlign(block);
 	if(curarea->headertype==HEADERTOP) {
 		uiDefIconBut(block, BUT, B_IPOCOPY, ICON_COPYUP,	xco+=XIC,0,XIC,YIC, 0, 0, 0, 0, 0, "Copies the selected curves to the buffer");