Disable autoplay or switch divs?

If this is in the wrong section please forgive my noobishness and feel free to move it where it needs to be.

I am currently working on a website and the client has asked me to include a swf animation on his new website. It was not made by me, nor do I have the .fla file.

While it is easy enough to display the file, the problem is he has asked me to disable it from autoplaying.

I was wondering if this was at all possible by editing the Javascript file? I was wondering if it was possible to call the "playagain" div first, leaving the "webvideo" div hidden untill the button is clicked.

Please could anyone tell me if any of this is possible. I do not know javascript, so I am really at a loss. Thank you.

Here is the javascript I am calling in to my html page..

if (typeof video == 'undefined') {

          video = new Object();

}

video.params = {

          width:280,

          height:360,

          left:"6px",

          right:"auto",

          autoplay:"false",

          top:"auto",

          bottom:"0px",

          vidlink:"",

          openin:"_blank",

          flv:"video",

          xmlPath:"data1.xml"

};

video.drawVideo= function(){

          var markUp = '';

          markUp += '<style type="text/css">';

          markUp += '#webvideo {position:fixed;width:'+video.params.width+'px;height:'+video.params.height+'px;left:'+video.params.left+';right:'+video.params.right+';top:'+video.params.top+';bottom:'+video.params.bottom+';z-index:500;}';

          markUp += '#playagain {position:fixed;left:1px;right:auto;top:auto;bottom:2px;z-index:2;visibility:hidden}';

          markUp += '</style>';

          markUp += '<div id="webvideo">';

          markUp += '  <object id="objvideo" style="outline:none;" type="application/x-shockwave-flash" width="280" height="360" wmode="transparent" data="videopresenter.swf">';

          markUp += '    <param name="movie" value="videopresenter.swf" />';

          markUp += '    <param name="quality" value="high" />';

          markUp += '    <param name="flashvars" value="vurl='+video.params.flv+'.flv&vwidth='+video.params.width+'&vheight='+video.params.height+'&vlink='+video.params.vidlink+'&openin='+video.params.openin+'&xmlPath='+video.params.xmlPath+'" />';

          markUp += '    <param name="wmode" value="transparent" />';

          markUp += '    <param name="allowscriptaccess" value="always" />';

          markUp += '    <param name="swfversion" value="9.0.45.0" />';

          markUp += '  </object>';

          markUp += '</div>';

          markUp += '<div id="playagain">';

          markUp += '<a href="javascript:showDiv()"><img src="videopresenter/images/playBtn.gif" width="82" height="32" border="0"/></a>';

          markUp += '</div>';

          document.write(markUp);

}

function thisMovie(movieName) {

    if (navigator.appName.indexOf("Microsoft") != -1) {

        return window[movieName]

    }

    else {

        return document[movieName]

    }

}

function closeDiv(){

          document.getElementById('webvideo').style.visibility = 'hidden';

}

function showPlayAgainButton(){

          document.getElementById('webvideo').style.zIndex='-100';

          document.getElementById('playagain').style.visibility = 'visible';

}

function showDiv(){

          thisMovie("objvideo").showPlayer();

          document.getElementById('webvideo').style.zIndex='1';

          document.getElementById('webvideo').style.visibility = 'visible';

          document.getElementById('playagain').style.visibility = 'hidden';

}

function lightsOff () {

            $("div#mainBody").animate({opacity: 0.3},500);

            return false;

}

function lightsOn() {

               $("div#mainBody").animate({opacity: 100},500);

               return false;

}

video.drawVideo();