.net动态调用视频URL

我在网上下载了一个叫"Vcastr 2.2 flv 网络播放器"插件，请教如何实现动态调用.cs页面中视频的URL?播放器代码如下：
<script type="text/javascript">
var swf_width=390
var swf_height=290
var texts='<%# Eval("magazine_Url") %>'
var files='<%# Eval("magazine_Url") %>';
document.write('<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" width="'+ swf_width +'" height="'+ swf_height +'">');
document.write('<param name="movie" value="http://www.yimagazine.com/vcastr22.swf?IsAutoPlay=1&BarPosition=1&IsShowBar=1&IsContinue=1&LogoText=yimagazine"><param name="quality" value="high">');
document.write('<param name="menu" value="false"><param name="allowFullScreen" value="true" />');
document.write('<param name="FlashVars" value="vcastr_file='+files+'&vcastr_title='+texts+'">');
document.write('<embed src="http://www.yimagazine.com/vcastr22.swf?IsAutoPlay=1&BarPosition=1&IsShowBar=1&IsContinue=1&LogoText=yimagazine" allowFullScreen="true" FlashVars="vcastr_file='+files+'&vcastr_title='+texts+'" menu="false" quality="high" width="'+ swf_width +'" height="'+ swf_height +'" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" />'); document.write('</object>');
 </script>