Flash isn't load in firefox

I’ve created a flash banner in action script 3.0. I’ve attached it with html with swfobject.js method and with wmode transparent. It works in IE 6/7, safari, opera, chrome, but it’s sometimes not load in firefox both 2.0 and 3.0. when i removed the wmode property form javascript. it works on firefox.

what we do now, help us. please…