Preload external swf's - preloader blinks for a sec. and disapears

here’s my script:

bytes_loaded =Math .round (this .getBytesLoaded ()) ;
bytes_total =Math .round (this .getBytesTotal ()) ;
getPercent =bytes_loaded /bytes_total ;
this .loadBar ._width =getPercent *100 ;
this .loadText =Math .round (getPercent *100 )+ “%” ;
if (bytes_loaded == bytes_total ){

this .gotoAndPlay (3);

}

Why doesn’t the preloader display in a normal way??? it blinks, showing “9%” and then disapears