Shpendi is on the right track, but not xHTML compliant. You didn't properly close the tag, didn't specify a border, why would you place the location as the alternative text?, and you should specify the dimensions for optimization, although it's not required for web standards compliance.
Image 1:
CODE
<img src="http://img256.imageshack.us/img256/6986/pumpkinunderbanner.png" alt="Pumpkins & Happy Halloween" style="border-style: none" width="350" height="25" />
Image 2:
CODE
<img src="http://img689.imageshack.us/img689/7882/pumpkinpip.png" alt="Happy Halloween" style="border-style: none" width="120" height="50" />
Image 3:
CODE
<img src="http://img396.imageshack.us/img396/8849/cactussignature.png" alt="Cactus signature" style="border-style: none" width="350" height="120" />
Edit: @ OP: For the alternative text (alt=""), you can put anything in there, but it's used to describe what the image is in a few words.