Suggest me an online tool to convert 'gif' image to 'jpg'

Visit http://www.zamzar.com/
In two clicks you can convert files from one format to another
It gives variety of convertion options like . . .

• Image formats
• Document formats
• Audio formats
• Video formats
• Other formats like (zip, cab etc,.)

Can I insert 'Photos' in Gmail? (Without using attachment link)

It's a new facility in GMail.

• Login GMail
  
• Click settings->Labs
• Scroll down to inserting images
• Click enable

From now on when you compose a mail in GMail, you will get this 'Insert Image' option.