Curses, Foiled Again by HTML

Okay, so I thought I'd add Barbara Tyroler's beautiful photo to my Website home page.  Piece of cake, right?  Turns out to be a quagmire of code that I cannot bend to my will.  Even though I didn't make the change go live, it somehow got there on its own.  Now the home page banner is askew and not lined up with the rest of the page. What you see above is what I want, but Dreamweaver doesn't want it and has woven me a nightmare. Help!  After hours of trying, I cannot fix it, nor can I take it back to its original.  I need an HTML genie.  Really.