Problem with alias in 'if' blocks

[morgan@xxxxxxxxxxxxxxxx (Brady Morgan)]

I attempting to convert from Csh to Zsh and have run into the following
problem.

I've isolated the problem to the following script, "simple":
 (NOTE: this listing is shown with line numbers obtained using "cat -n")

     1	#!/usr/local/bin/zsh
     2	
     3	if [ 1 ]; then
     4	    alias mycmd='echo "MYCMD ALIAS"'
     5	
     6	    if [ 1 ]; then
     7		mycmd
     8	    fi
     9	
    10	    mycmd
    11	fi
    12	
    13	mycmd

When executed, I get this result:

simple: command not found: mycmd [7]
simple: command not found: mycmd [10]
MYCMD ALIAS


Can someone explain why the alias isn't "known" until I'm out of the
"if" loop?  Also, if I've goofed with this, could someone demonstrate
the proper way to achieve the desired result.

This script works with Csh (i.e., when it's in Csh syntax).

I checked the Zsh documentation, the Zsh web site, and the DejaNews
news archives, but couldn't find anything regarding this issue.

Here's my setup:
	OS	   : SunOS 4.1.3_U1  sun4m
	Zsh Version: 3.0.2
	Compiler   : gcc version 2.7.2

Any help will be greatly appreciated!!