You can't. You can only point to another URL where the image exists. Otherwise, as Graham says, it won't be long before someone starts putting pictures of knobs up there. I wonder who he could mean???
I wish people would make their postings easier to read. I'm not expecting perfect English or perfect spelling, you read a couple of the Monks threads and you still understand them (almost).
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All that I am saying is that people should make more use of the space bar to leave spaces in between sentences and it also helps if the new sentence starts with a capital letter by pressing the SHIFT key (the ones right and left with upward pointing arrows on them.
Also, a good point to remember to make you postings easier to read is to make your paragraphs smaller. Or at the very least make up some paragraphs.
Some people just type and type and it all comes out in one enormous block and you spend most of the evening trying to understand what they're trying to say. I never thought I would say this, but look at Ron Clay's postings.
They're always broken down into very short paragraphs. He's obviously learned a lot from readin his favourite daily newspaper where they print like this to make it easier reading - THE MIRROR!
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The only other thing I would add is take your time and try to really think through what points you want to make. Also consider whether your posting might upset someone unduly. We all have feeling you know, even monkeys.