if(document.images){

     img01_on=new Image(); img01_off=new Image(); //ƒfƒŠƒwƒ‹‘ε’ˁE‘ƒŠ›
     img02_on=new Image(); img02_off=new Image(); //ƒfƒŠƒwƒ‹ις’J
     img03_on=new Image(); img03_off=new Image(); //ƒfƒŠƒwƒ‹a’J
     img04_on=new Image(); img04_off=new Image(); //ƒfƒŠƒwƒ‹‚»‚Μ‘Ό
     img05_on=new Image(); img05_off=new Image(); //ƒAƒWƒAƒ““ϊ•ι—’
     img06_on=new Image(); img06_off=new Image(); //ƒAƒWƒAƒ“‚»‚Μ‘Ό
     img07_on=new Image(); img07_off=new Image(); //ƒfƒŠƒwƒ‹‘ε’ˁEŽα‚’–Ί
     img08_on=new Image(); img08_off=new Image(); //ƒfƒŠƒwƒ‹‘ε’ˁElΘŒn
     img09_on=new Image(); img09_off=new Image(); //ƒfƒŠƒwƒ‹‘ε’ˁEκ–ε“X
     img10_on=new Image(); img10_off=new Image(); //ƒfƒŠƒwƒ‹‘ε’ˁEƒI[ƒ‹ƒ‰ƒEƒ“ƒh
     img11_on=new Image(); img11_off=new Image(); //ƒfƒŠƒwƒ‹ΤβE˜Z–{–Ψ

}


function preLoad_btn(){

	img01_on.src="image/btn/btn_otsuka_on.gif"; //ƒfƒŠƒwƒ‹‘ε’ˁE‘ƒŠ›
	img01_off.src="image/btn/btn_otsuka_off.gif";
	img02_on.src="image/btn/btn_uguisu_on.gif"; //ƒfƒŠƒwƒ‹ις’J
	img02_off.src="image/btn/btn_uguisu_off.gif";
	img03_on.src="image/btn/btn_shibuya_on.gif"; //ƒfƒŠƒwƒ‹a’J
	img03_off.src="image/btn/btn_shibuya_off.gif";
	img04_on.src="image/btn/btn_etc_on.gif"; //ƒfƒŠƒwƒ‹‚»‚Μ‘Ό
	img04_off.src="image/btn/btn_etc_off.gif";
	img05_on.src="image/btn/btn_asia_on.gif"; //ƒAƒWƒAƒ““ϊ•ι—’
	img05_off.src="image/btn/btn_asia_off.gif";
	img06_on.src="image/btn/btn_asiaetc_on.gif"; //ƒAƒWƒAƒ“‚»‚Μ‘Ό
	img06_off.src="image/btn/btn_asiaetc_off.gif";
	img07_on.src="image/btn/btn_otsuka1_on.gif"; //ƒfƒŠƒwƒ‹‘ε’ˁEŽα‚’–Ί
	img07_off.src="image/btn/btn_otsuka1_off.gif";
	img08_on.src="image/btn/btn_otsuka2_on.gif"; //ƒfƒŠƒwƒ‹‘ε’ˁElΘŒn
	img08_off.src="image/btn/btn_otsuka2_off.gif";
	img09_on.src="image/btn/btn_otsuka3_on.gif"; //ƒfƒŠƒwƒ‹‘ε’ˁEκ–ε“X
	img09_off.src="image/btn/btn_otsuka3_off.gif";
	img10_on.src="image/btn/btn_otsuka4_on.gif"; //ƒfƒŠƒwƒ‹‘ε’ˁEƒI[ƒ‹ƒ‰ƒEƒ“ƒh
	img10_off.src="image/btn/btn_otsuka4_off.gif";
	img11_on.src="image/btn/btn_6pon_on.gif"; //ƒfƒŠƒwƒ‹ΤβE˜Z–{–Ψ
	img11_off.src="image/btn/btn_6pon_off.gif";

}


function rollon(img){
        imgon=eval(img+"_on.src");
        if((document.images)&&(imgon)){
                document.images[img].src=eval(img+"_on.src");
	}
}

function rolloff(img){
	imgoff=eval(img+"_off.src");
	if((document.images)&&(imgoff)){
		document.images[img].src=eval(img+"_off.src");
	}
}