var pop = null;
function popdown() {
if (imgWin && !imgWin.closed) imgWin.close();
}
window.onunload = popdown;
window.onfocus = popdown;
function popUpImg(img,title,w,h) {
myImg = new Image();
myImg.src = img;
/* var width = myImg.width;
var height = myImg.height;*/
var width = w;
var height =h;
LeftPos=(screen.width) ? (screen.width-width)/2 :0;
TopPos=(screen.height) ? (screen.height-height)/2 :0;
imgWin = window.open('', 'imgWinName', 'width=' + width + ', height=' + height +',top='+TopPos+',left='+LeftPos);
with (imgWin.document) {
open();
write('');
write(' ');
write(' '+title+'');
write(' ');
write(' ');
write(' ')
write(' 
');
write(' ');
write('');
close();
}
if (imgWin) return false;
}