The format is:
<img src="[IMAGE URL GOES HERE]" alt="[ALT TEXT HERE]">
Notice that the attribute name is SRC, not SCR. This is what I've seen a lotta people mess up. Maybe they think it's "scr" for "screen" or something, I dunno,
but it's actually SRC for SouRCe.
For added functionality and standards compliance, include the width and height (in pixels):
<img src="[IMAGE URL GOES HERE]" width="[X]" height="[Y]" alt="[ALT TEXT HERE]">
For example, <img src="http://www.conmicro.cx/~kturtle/cartoons/2004/timmosanta.jpg" width="414" height="483" alt="Timmo Warner in a Santa hat"> produces this:
EDIT: Read the comments below for more helpful tips. :}