I've found solution around this problem. First the, when I try set id getelementbyid with flashContent it didn't run well. But when I try with id="dua" it didn't run weel too. So, I check it with inspect the element, and I found that the object was being displayed is the second one which doesnot contain id. So, I give an id and call it in getelementbyid. So, when I try test it in any browser, it run well but when I try to test it in IE, I must set the getelementbyid with IE methode provide.
-CMIIW-