var gPreloadFlag = false;
var gImgSrc = new Array();
gImgSrc['sn_01_on'] = 'images/sn_01_on.gif';
gImgSrc['sn_01_out'] = 'images/sn_01_out.gif';
gImgSrc['sn_02_on'] = 'images/sn_02_on.gif';
gImgSrc['sn_02_out'] = 'images/sn_02_out.gif';
gImgSrc['sn_03_on'] = 'images/sn_03_on.gif';
gImgSrc['sn_03_out'] = 'images/sn_03_out.gif';
gImgSrc['sn_04_on'] = 'images/sn_04_on.gif';
gImgSrc['sn_04_out'] = 'images/sn_04_out.gif';
gImgSrc['sn_05_on'] = 'images/sn_05_on.gif';
gImgSrc['sn_05_out'] = 'images/sn_05_out.gif';