http://www.newtriks.com/2009/05/18/flex-ant-tasks-incorporating-a-swfobject-wrapper-template/

build.xml

<?xml version="1.0"?>
<!-- ====================================================================== 
     Flex ANT Build Script
     
     - Deletes build and template directory
     - Creates build, assets and templates directories
     - Compiles release and debug swf's
     - Connects to svn (Adobe Flex Opensource)
     - Svn checkout of latest Flex SDK > templates > SWFObject
     - Creates html wrappers for release and debug using SWFObject template
     - Copy asset librarys across to release and debug dir
     - Cleanup > delete temporary template directory
     
     ** NOTES **
     
     Each build will run the above tasks.  This is by no means suggested
     all should be run on each build.  Its all incorporated in one continuous 
     script for example purposes.  A suggestion would be to seperate the 
     SVN task retrieving the latest Flex SDK SWFObject release and running
     on project creation thus ensuring you have the latest build.
                   
     Author: Newtriks (simon@newtriks.com)        
     Date :17th May 2009
     
     [Based on portions of code written by:Constantiner(constantiner@gmail.com)]                                                       
     ====================================================================== -->
<project name="Flex Ant Tasks Build Script" default="build" basedir=".">
 
	<!-- load previously defined configuration properties file -->
	<property file="build.properties" />

	<!-- flexTasks.jar copied to the libs folder to distribute with the project -->
	<taskdef resource="flexTasks.tasks" classpath="${flex.tasks.jar}"/> 
	
	<!-- SVN classpath including jars required -->
	<path id="svnant.class.path">
		<pathelement location="${svn.ant.jar}" />
		<pathelement location="${svn.clientadapter.jar}" />
		<pathelement location="${svn.javahl.jar}" />
	</path>
	
	<!-- Load the svn task -->
	<taskdef resource="svntask.properties" classpathref="svnant.class.path"/>
    
	<!-- ================================= 
          target: build              
         ================================= -->
	<target name="build"
			depends="clear,
	    			 init,
	    			 compile.release,
					 compile.debug,
					 svnant-availability,
					 svn.checkout.template,
					 make.release.wrapper,
					 make.debug.wrapper,
		 			 copy.assets,
					 templates.cleanup" 
			description="${PROJECT.FULLNAME}">
	 </target>
	
	<!-- - - - - - - - - - - - - - - - - - 
          target: clear                      
         - - - - - - - - - - - - - - - - - -->
	<target name="clear">
		<tstamp>
			<format property="build.datetime" pattern="dd/MM/yyyy hh:mm:ss aa" />
		</tstamp>
		<echo message="============================================="/>
		<echo message="${PROJECT.NAME}-${PROJECT.VERSION} [${build.datetime}]"/>
		<echo message="Copyright (c) ${PROJECT.YEAR} ${PROJECT.OWNER}"/>
		<echo message="OS : ${os.name}" />
		<echo message="Author: ${AUTHOR}" />
		<echo message="=============================================="/>
		<delete dir="${build.dir}" failonerror="false" />
		<delete dir="${basedir}/templates" failonerror="false" />
	</target>
	
	<!-- - - - - - - - - - - - - - - - - - 
          target: init                      
         - - - - - - - - - - - - - - - - - -->
    <target name="init">
    	<mkdir dir="${build.dir}"/>
    	<mkdir dir="${release.build.dir}"/>
    	<mkdir dir="${debug.build.dir}"/>
    	<mkdir dir="${release.build.dir.assets}"/>
    	<mkdir dir="${debug.build.dir.assets}"/>
    	<mkdir dir="${basedir}/templates"/>
    </target>

	<!-- - - - - - - - - - - - - - - - - - 
          target: svnant-availability                      
         - - - - - - - - - - - - - - - - - -->
	<target name="svnant-availability">
			<available resource="svntask.properties" classpathref="svnant.class.path" property="available.svnant" />
			<echo message="SVN ANT is available = ${available.svnant}"/>
	</target>
	
    <!-- - - - - - - - - - - - - - - - - - 
          target: compile.release
         - - - - - - - - - - - - - - - - - -->
    <target name="compile.release">
    	<mxmlc.compile
    		in="${main.application}"
    		out="${main.application.release.out}" />
    </target>
	
    <!-- - - - - - - - - - - - - - - - - - 
          target: compile.debug
         - - - - - - - - - - - - - - - - - -->
    <target name="compile.debug">
    	<mxmlc.compile
    		in="${main.application}"
    		out="${main.application.debug.out}"
    		debug="true" />
    </target>

	<!-- - - - - - - - - - - - - - - - - - 
	          target: svn.checkout.template
	         - - - - - - - - - - - - - - - - - -->
	<target name="svn.checkout.template">
		<svn>
			<checkout url="${wrapper.template.url}" revision="HEAD" destPath="${wrapper.dir}" />
		</svn>
	</target>
	
	<!-- - - - - - - - - - - - - - - - - - 
	          target: make.debug.wrapper
	         - - - - - - - - - - - - - - - - - -->
	<target name="make.debug.wrapper">
	    <make.wrapper
	    	 			width="${swf.width}"
	    				height="${swf.height}"
	    				title="${swf.debug.title}"
	    				version.major="${swf.version.major}"
	    				version.minor="${swf.version.minor}"
	    				version.revision="${swf.version.revision}"
	    				application="${output.swf.name}"
	    				swf="${output.swf.name}"
	    				bgcolor="${swf.bgcolor}"
	    				wrapper.dir="${wrapper.dir}"
	    				output.dir="${debug.build.dir}"
	    				output.html="${output.debug.html}" />
	</target>
	
	<!-- - - - - - - - - - - - - - - - - - 
	          target: make.release.wrapper
	         - - - - - - - - - - - - - - - - - -->
	<target name="make.release.wrapper">
	    <make.wrapper
	    	 			width="${swf.width}"
	    				height="${swf.height}"
	    				title="${swf.release.title}"
	    				version.major="${swf.version.major}"
	    				version.minor="${swf.version.minor}"
	    				version.revision="${swf.version.revision}"
	    				application="${output.swf.name}"
	    				swf="${output.swf.name}"
	    				bgcolor="${swf.bgcolor}"
	    				wrapper.dir="${wrapper.dir}"
	    				output.dir="${release.build.dir}"
	    				output.html="${output.release.html}" />
	</target>
	
	<!-- - - - - - - - - - - - - - - - - - 
	          target: copy.assets
	         - - - - - - - - - - - - - - - - - -->
	<target name="copy.assets">
		<copy todir="${debug.build.dir.assets}">
			<!-- Ensure any fonts directories are not copied to debug -->
			<fileset dir="${assets.dir}" includes="**/*" excludes="**/fonts/" />
		</copy>	
		<copy todir="${release.build.dir.assets}">
			<fileset dir="${assets.dir}" includes="**/*" />
		</copy>	
	</target>

	<!-- - - - - - - - - - - - - - - - - - 
	          target: templates.cleanup
	         - - - - - - - - - - - - - - - - - -->
	<target name="templates.cleanup">
		<delete dir="${basedir}/templates" failonerror="false" />	
	</target>
	
	<!-- = = = = = = = = = = = = = = = = =
          macrodef: mxmlc.compile          
         = = = = = = = = = = = = = = = = = -->
    <macrodef name="mxmlc.compile">
        <attribute name="in" />
        <attribute name="out" />
    	<attribute name="config" default="${flex.config.xml}" />
    	<attribute name="additional" default="" />
    	<attribute name="incremental" default="false" />
    	<attribute name="debug" default="false" />
		<sequential>
			<mxmlc 
	        	    file="@{in}" 
				    output="@{out}"
					fork="true"
				    maxmemory="1024m"
				    actionscript-file-encoding="${default.encoding}"
				    keep-generated-actionscript="false"
				    incremental="@{incremental}"
					debug="@{debug}">
	        		
	                <!-- Get default compiler options. -->
	            	<load-config filename="@{config}" />           
				 
	            	<!-- List of path elements that form the roots of ActionScript class hierarchies. -->
	            	<compiler.source-path path-element="${FLEX_HOME}/frameworks"/>
					<compiler.source-path path-element="${src.dir}"/> 			
				
		            <!-- List of built in SWC files or directories that contain SWC files. -->
		            <compiler.library-path dir="${FLEX_HOME}/frameworks/libs" append="true">
		            	<include name="*" />
		                <include name="../bundles/{locale}" />
		            </compiler.library-path>
						
					<!-- Project SWC library -->
		            <compiler.library-path dir="${libs.dir}" append="true">
		                <include name="**.swc" />
		            </compiler.library-path>
					
		            <!-- SWF dimensions --> 
		            <default-size width="${swf.width}" height="${swf.height}" />
		    </mxmlc>
	    	<echo>Succesfully compiled @{in} to @{out}</echo>
	    </sequential>
   	</macrodef>

	<!-- = = = = = = = = = = = = = = = = =
          macrodef: make.wrapper          
         = = = = = = = = = = = = = = = = = -->
    <macrodef name="make.wrapper">
        <attribute name="width" default="100%" />
        <attribute name="height" default="100%" />
        <attribute name="title" default="" />
        <attribute name="version.major" default="9" />
        <attribute name="version.minor" default="0" />
        <attribute name="version.revision" default="124" />
        <attribute name="application" default="" />
        <attribute name="swf" default="" />
        <attribute name="bgcolor" default="#FFFFFF" />
        <attribute name="wrapper.dir" />
        <attribute name="output.dir" />
        <attribute name="output.html" />
        <sequential>
        	<copy todir="@{output.dir}">
        		<fileset dir="@{wrapper.dir}">
    	    		<exclude name="**/index.template.html" />
        		</fileset>
        	</copy>
	    	<copy 
	    		file="@{wrapper.dir}/index.template.html"
	    		tofile="@{output.html}" />
        	<replaceregexp 
        		file="@{output.html}"
        		flags="gs"
        		match="\$\{width\}"
        		replace="@{width}"/>
        	<replaceregexp 
        		file="@{output.html}"
        		flags="gs"
        		match="\$\{height\}"
        		replace="@{height}"/>
        	<replaceregexp 
        		file="@{output.html}"
        		flags="gs"
        		match="\$\{title\}"
        		replace="@{title}"
        		encoding="utf-8"/>
        	<replaceregexp 
        		file="@{output.html}"
        		flags="gs"
        		match="\$\{version_major\}"
        		replace="@{version.major}"/>
        	<replaceregexp 
        		file="@{output.html}"
        		flags="gs"
        		match="\$\{version_minor\}"
        		replace="@{version.minor}"/>
        	<replaceregexp 
        		file="@{output.html}"
        		flags="gs"
        		match="\$\{version_revision\}"
        		replace="@{version.revision}"/>
        	<replaceregexp 
        		file="@{output.html}"
        		flags="gs"
        		match="\$\{application\}"
        		replace="@{application}"/>
        	<replaceregexp 
        		file="@{output.html}"
        		flags="gs"
        		match="\$\{bgcolor\}"
        		replace="@{bgcolor}"/>
        	<replaceregexp 
        		file="@{output.html}"
        		flags="gs"
        		match="\$\{swf\}"
        		replace="@{swf}"/>
        	<echo>Succesfully wrapped @{swf}.swf into "@{output.html} using template: ${wrapper.template}</echo>
        </sequential>
    </macrodef>
	
</project>