var imgObj;
function chkImg(strURL,winName){
  if (typeof(imgObj) == "object"){
    if ((imgObj.width != 0) && (imgObj.height != 0))
      showpicwin(strURL,winName, ",width=" + (imgObj.width+20) + ",height=" + (imgObj.height+30) + ",left=" + (screen.width-imgObj.width)/2 + ",top=" + (screen.height-imgObj.height)/3);
  }
}

function showpicwin(strURL,winName,features) {
  var vPic, sBaseCmd;
  sBaseCmd = "toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no,";
  if (features == null || features == ""){
    imgObj = new Image();
    imgObj.src = strURL;
    chkImg(strURL, winName)
  }
  else{
	vPic = window.open("",winName, sBaseCmd + features);
	vPic.opener = self;
	vPic.document.writeln('<IMG SRC="' + strURL + '" BORDER=0>');
	//vPic.document.bgColor="#F4FCCD";
	vPic.focus();
  }
}