奇怪了，为什么“语句未结束”

[fisherboy]

<SCRIPT LANGUAGE="vbScript">
HelpUrl="http://www.baidu.com"
HelpTopic="百度"
HelpData="<a href="&HelpUrl&" target=_blank>"&HelpTopic&"</a>"
MsgBox HelpData
</SCRIPT>
以前一样的代码都不会，现在出错了。
为什么？

[hookee]

VBS中&H是16进制的开头字符
所以& H开头的变量，要在&后面加空格
<SCRIPT LANGUAGE="vbScript">
HelpUrl = "http://www.baidu.com"
HelpTopic = "百度"
HelpData = " <a href=" & HelpUrl & " target=_blank>" & HelpTopic & " </a>"
MsgBox HelpData
</SCRIPT>

[jinjazz]

<SCRIPT LANGUAGE="vbScript"> 
 HelpUrl="http://www.baidu.com" 
 HelpTopic="百度" 
 HelpData=" <a href="+HelpUrl+" target=_blank>"+HelpTopic+" </a>" 
 MsgBox HelpData 
  </SCRIPT>