Green Screen issue with an flv file

I am attempting to create a Green Screen were I walk out onto my website and speak to the viewer. Everything looks good and plays within Premiere but after exporting and placing it on my webpage a black background shows instead of the background being transparent. can someone help with what I am doing wrong?

> and are flv files the only ones that I would run into this with?
There are other kinds of files that can include alpha channels (transparency). Just so that you know what to look for, QuickTime and some other formats require you to specify the inclusion of an alpha channel from a color depth or channels menu. In some cases, a plus sign (as in Millions Of Colors+) denotes an alpha channel. Similarly, choosing to output to 32 bits per pixel implies an output depth of 8 bits per channel for each of four channels: RGBA (where A is for alpha).
But, yes, FLV with video encoded with the On2 VP6 codec is the main format for web video that supports alpha channels.

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