function openBrWindow(theURL,winName,width,height,features) { //v3.1
    var window_width = width;
    var window_height = height;
    var newfeatures= features;
    var window_top = (screen.height-window_height)/2;
    var window_left = (screen.width-window_width)/2;
    newWindow=window.open(''+ theURL + '',''+ winName + '','width=' + window_width + ',height=' + window_height + ',top=' + window_top + ',left=' + window_left + ',features=' + newfeatures + '');
    //newWindow.focus();
}

//////////////////////////////////////////////////////////////////////////
//自适应图片大小的弹出窗口
var imgObj;
function checkImg(theURL,winName){
  if (typeof(imgObj) == "object"){
    if ((imgObj.width != 0) && (imgObj.height != 0))
      //  20 和 30 是设置的窗口边框与图片间的间隔量
      OpenFullSizeWindow(theURL,winName, ",width=" + (imgObj.width+20) + ",height=" + (imgObj.height+30));
    else
      // 每隔100毫秒重复调用检查
      setTimeout("checkImg('" + theURL + "','" + winName + "')", 100)
  }
}

function OpenFullSizeWindow(theURL,winName,features) {
  var aNewWin, sBaseCmd;

  sBaseCmd = "toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no,";
  if (features == null || features == ""){
    imgObj = new Image();
    imgObj.src = theURL;
    checkImg(theURL, winName)
  }
  else{

    aNewWin = window.open(theURL,winName, sBaseCmd + features);
	aNewWin.focus();
  }
}