//让图片不变形，修改图片的最大高和宽值

function DrawImage(ImgD, MaxWidth, MaxHeight) {
    var image = new Image();
    image.src = ImgD.src;
    if (image.width > 0 && image.height > 0) {
        if (image.width / image.height >= MaxWidth / MaxHeight) {
            if (image.width > MaxWidth) {
                ImgD.width = MaxWidth;
                ImgD.height = (image.height * MaxWidth) / image.width;
            } else {
                ImgD.width = image.width;
                ImgD.height = image.height;

            }
            //ImgD.alt="点击新窗口中查看大图..."; 
        }
        else {
            if (image.height > MaxHeight) {
                ImgD.height = MaxHeight;
                ImgD.width = (image.width * MaxHeight) / image.height;
            } else {
                ImgD.width = image.width;
                ImgD.height = image.height;
            }
            //ImgD.alt="点击新窗口中查看大图..."; 
        }
    }

}

checkInstalled = function(m) 
{ 
  switch(m)
  { 
	case 'msn': 
	try 
	{ 
	  new ActiveXObject("MSNMessenger.P4QuickLaunch"); 
	  return true; 
	} 
	catch (e) 
	{ 
	  return false; 
	} 
	case 'skype': 
	try
	{ 
	  new ActiveXObject("Skype.Detection"); 
	  return true; 
	}
	catch(e)
	{ 
	  return false; 
	} 
	case 'qq': 
	try 
	{ 
	  new ActiveXObject("TimwpDll.TimwpCheck"); 
	  return true; 
	} 
	catch (e) 
	{ 
	  return false; 
	} 
  } 
}