Use this plugin instead of tiresome saving images from the internet and uploading them to your blog. You learn the value of this grabber e.g. when you need to move your old non-WordPress site with many pictures to the WordPress-based. The plugin recognizes images by the presence (jpg|jpeg|gif|png) in URLs.
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Please feel free to contact me with your questions or suggestions.
This plugin is available for download to be used on your WordPress self-hosted installation.