diff --git a/scripting.py b/scripting.py
index ced63da..3dd98f3 100644
--- a/scripting.py
+++ b/scripting.py
@@ -166,38 +166,32 @@ class Synt(Typeable):
 class SyntDesc(Synt):
     @classmethod
     def StForTypein(cls):
-        for desce in cls.desc:
+        for desce in cls.Desc():
             if isinstance(desce, list) and len(desce) == 1:
                 return desce[0]
 
     @staticmethod
     def DefProp(isynt):
-        def get(self):
+        def getI(self):
             return self.rgsynt[isynt]
-        def set(self, syntNew):
+        def setI(self, syntNew):
             self.Replace(isynt, syntNew)
-        return property(get, set)
+        return property(getI, setI)
 
+    @classmethod
+    def Desc(cls):
+        return cls.desc
     def Populate(self):
-        for desce in self.desc:
+        for desce in self.Desc():
             if isinstance(desce, tuple):
                 synt = desce[0].SyntDefault(self)
                 self.rgsynt.append(synt)
 #        for synt in self.rgsynt:
 #            synt.Populate()
-
-    def SyntProperty(self, isynt):
-        def get():
-            return self.rgsynt[isynt]
-        def set(syntNew):
-            self.Replace(isynt, syntNew)
-        def delete():
-            self.Replace(isynt, None)
-        return property(get, set, delete)
     
     def DesceChild(self, isyntChild):
         isyntDesce = 0;
-        for desce in self.desc:
+        for desce in self.Desc():
             if isinstance(desce, tuple):
                 if isyntDesce == isyntChild:
                     return desce
@@ -223,7 +217,7 @@ class SyntDesc(Synt):
     def Project(self, pcur):
         "adds more horizontal pws to a horizontal pw"        
         isynt = 0
-        for desce in self.desc:
+        for desce in self.Desc():
             if isinstance(desce, str):
                 PwStatic(pcur.PwHoriz(self), desce)
             elif isinstance(desce, list):
@@ -241,9 +235,15 @@ class SyntName(Synt):
         return self.GetStTypein()
         
 class SyntExpr(Synt):
+    rgclsSyntOp = []
     @classmethod
     def RgsyntReplace(cls, syntChild, st, rtype):
-        return RtypeAny().RgsyntFromSt(syntChild.syntParent, st)
+        for synt in RtypeAny().RgsyntFromSt(syntChild.syntParent, st):
+            yield synt
+        for clsSyntOp in cls.rgclsSyntOp:
+            if clsSyntOp.StForTypein().lower().startswith(st.lower()):
+                yield clsSyntOp.SyntDefault(None)
+
     def Project(self, pcur):
         self.syntParent.ProjectTypeinForChild(pcur.PwHoriz(self), self, "     ")
     
@@ -301,6 +301,8 @@ class SyntLit(Synt):
         return self.rtype
     def Project(self, pcur):
         self.syntParent.ProjectTypeinForChild(pcur.PwHoriz(self), self, self.StForTypein())
+    def Exec(self, ectx):
+        return self.value
             
 @RegStmt
 class SyntVar(SyntDesc):
@@ -325,7 +327,37 @@ class SyntVarRef(Synt):
         return self.syntVar.name.St()
     def Project(self, pcur):
         self.syntParent.ProjectTypeinForChild(pcur.PwHoriz(self), self, self.StForTypein())
-    
+
+class SyntBinOp(SyntDesc):
+    @classmethod
+    def Desc(cls):
+        return [(SyntExpr, None), " ", [cls.op], " ", (SyntExpr, None)]
+    left = SyntDesc.DefProp(0)
+    right = SyntDesc.DefProp(1)
+    @classmethod
+    def Create(cls, op, rtype, dgEval = None, stNameI = None):
+        def Decorate(dgEval):
+            stName = stNameI or dgEval.__name__
+            def Eval(self, ectx):
+                return dgEval(self.left.Eval(ectx), self.right.Eval(ectx))
+            clsNew = type(stName, (cls,), {"Eval": Eval, "op": op})
+            SyntExpr.rgclsSyntOp.append(clsNew)
+            return clsNew
+
+        if dgEval == None: # used as a decorator
+            return Decorate
+        clsNew = Decorate(dgEval)
+        if stNameI != None:
+            globals()[stNameI] = clsNew
+        return clsNew
+
+SyntBinOp.Create("+", RtypeNum(), lambda l,r: l + r, "SyntPlus")
+SyntBinOp.Create("-", RtypeNum(), lambda l,r: l - r, "SyntMinus")
+SyntBinOp.Create("*", RtypeNum(), lambda l,r: l * r, "SyntMult")
+SyntBinOp.Create("/", RtypeNum(), lambda l,r: l / r, "SyntDiv")
+SyntBinOp.Create("=", RtypeBool(), lambda l,r: l == r, "SyntEq")
+SyntBinOp.Create(">", RtypeBool(), lambda l,r: l > r, "SyntGt")
+
 @RegStmt    
 class SyntIf(SyntDesc):
     desc = [["If"], " ", (SyntExpr, (1, RtypeBool)), ", then:", (SyntBlock, None), "or else:", (SyntBlock, None)]
@@ -634,12 +666,12 @@ class PwDropdown(PwBlock):
             PwBlock.Draw(self, ascr, x, y + 1, w, 0, mpksel, False)
 
 class PwList(PwContainer):
-    def __init__(self, pwParent, scril, dxIndent):
+    def __init__(self, pwParent, synt, dxIndent):
         PwContainer.__init__(self, pwParent)
-        self.scril = scril
+        self.synt = synt
         self.dxIndent = dxIndent
     def Value(self):
-        return self.scril
+        return self.synt
     def DxDyNew(self, w, dxStart, mpksel):
         dx = dxStart
         dy = 0