How can I send variable value to html property for descriptive programming in QTP

[QTPian]

Hi QTPKing..

Thanks for your reply. But the same is not working for me.. I am getting the following error message,
"Cannot identify the object "[ WebButton ]" (of class WebButton). Verify that this object's properties match an object currently displayed in your application."

here is my code,

Code:

Systemutil.Run "iexplore.exe", "http://www.bing.com"
Dim testid
testid = "sb_form_go"
Browser("name:=Bing").Page("title:=Bing").WebButton("html tag:=INPUT,  html id:="&testid).Click

Please let me know of the issues in the same.

Thanks,