imgtop=1;
imgleft=1;
document.write("<img id='image'src=''style='position:absolute;z_index:2;");
document.write("top:"+imgtop+";left:"+imgleft+";display:none;'");
document.write("onclick='imgopen(imgtemp)'title='クリックで閉じる'>");
imgobj=document.images.image;
imgtemp="";
function imgopen(imgsrc){
if(imgtemp!=imgsrc){
imgtemp=imgsrc;
imgobj.src=imgsrc;
scrollImg();
imgobj.style.display="block";
}else{imgobj.style.display="none";imgtemp="";}
}
function scrollImg(){
if(document.all)
imgobj.style.top=document.body.scrollTop+imgtop;
else
imgobj.style.top=pageYOffset+imgtop+"px";
}
onscroll = scrollImg;