插入统计代码错误

[胡扬已经存在]

想要给数据库中插入这样一段：
<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
try {
var pageTracker = _gat._getTracker("UA-12298331-1");
pageTracker._trackPageview();
} catch(err) {}</script>

其他加了这个就会报错document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
去掉就不报错了，
怎样才能正常插入document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));

[Dogfish]

写完之后，<script>里有个<script>，这个当然出错。

[Dogfish]

可以参考这里

http://topic.csdn.net/t/20051104/13/4371561.html

[胡扬已经存在]

加<script>不报错
加document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
报错

[胡扬已经存在]

document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));

[胡扬已经存在]

知道原因le