problem of the output of flash when it add in a webpage

i created a flash in flashcs3 and i add it to my webpage and i add some code in my flash in my webpage like this

Code:

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<param name="wmode" value="transparent">
and i add the code wmode="transparent" in the <embed>code

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so that the background of my flash is transparent but when my flash is finish theres a line that appears i don't know why? and how can i erase that line..

I hope you can help me..

thank you..