function iopen(imgf,name,imgW,imgH){
  var isIE = (navigator.appName.indexOf("Microsoft") != -1) ? true : false;
  var maxW = screen.availWidth;
  var maxH = screen.availHeight;
  var pscroll='0';
  var centerW=(maxW-imgW)/2;
  var centerH=(maxH-imgH)/2;
  if(isIE) centerH -=20;
  ((imgW>maxW || imgH>maxH))? pscroll='1' : pscroll='0';
  imgWindow=window.open(imgf, name, 'top='+centerH+',left='+centerW+',width='+imgW+',height='+imgH+',resizable=0,scrollbars='+pscroll);
  //imgWindow.focus();
}