Image_no=1;
kawa=Array(3);
kawa[1]=new Image();kawa[1].src="bl_8/memo_171.jpg";
kawa[2]=new Image();kawa[2].src="bl_8/memo_172.jpg";
kawa[3]=new Image();kawa[3].src="bl_8/memo_173.jpg";



function change_ima(){
        document.ima.src=kawa[Image_no].src;
        setTimeout('change_ima()',150);
        Image_no=Image_no + 1;
        if(Image_no > 3){
        Image_no= 1;
        }
}