an image having blend mode as multiply,(its kind of reducing opacity) its showing its effect in adobe fireworks but its not showing the same effect,when overlapped on another image in browser.
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Ah, okay. This is way more clear than your other phrasing of this same question.
The issue is that the graphics formats supported by browsers do not enable fancy layer-compositing like this. GIF files have a very simple one-color-is-clear transparency, and the PNG format allows you to specify an alpha channel, which is a simple degree-of-transparency per-pixel. There's no browser magic which allows an image file to act as a multiply layer.
This question is really off-topic here; here's the same question on Stack Overflow: https://stackoverflow.com/questions/2958813/how-to-replicate-ps-multiply-layer-mode , which basically is answered with "can't do it".
You may, however, be able kludge do it with SVG and HTML 5. SVG has an "feBlend" element which has a "multiply" mode, and the non-standard behavior described in that mozillazine link may make it work in some cases, or may make it into future standards. I wouldn't hold my breath, though. Best to find some other way to accomplish what you're trying to do.