如何使用installshield在安装过程中变换背景图片?

///////////////////////////////////////////////////////////////////////////////
//
// Function: SetupScreen
//
// Purpose: This function establishes the screen look. This includes
// colors, fonts, and text to be displayed.
//
///////////////////////////////////////////////////////////////////////////////
function SetupScreen()

begin

szBitmap=SUPPORTDIR^"setup.bmp;255,255,255";//图片背景色为黑色
PlaceBitmap(szBitmap, 7/*背景图片的索引值,可任意设定*/,
CENTERED, CENTERED, 0);

Enable( FULLWINDOWMODE );
Enable( INDVFILESTATUS );
SetTitle( @TITLE_MAIN, 24, WHITE );

SetTitle( @TITLE_CAPTIONBAR, 0, BACKGROUNDCAPTION ); // Caption bar text.

Enable( BACKGROUND );

Delay( 1 );
end;
//55

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