function imagepop(imgfile,winname,imgwidth,imgheight){
var features = "toolbar=no,location=no,directories=no,status=yes,menubar=no,scrollbars=no,resizable=no";
if(window.screen){
var myLeft = (screen.width-imgwidth)/2;
var myTop = (screen.height-imgheight)/2;
features+=',left='+myLeft+',top='+myTop;
}
imagepopup = window.open('','',features+',width='+imgwidth+',height='+imgheight);
with (imagepopup) {
document.open();
document.write(''+winname+'');
document.write('');
document.write('');
document.write('');
document.write('
');
document.write('');
document.close();
}
}