You want to use a semicolon, not a comma, to seperate statements.
Code:
onmouseover="image1.src='http://www.qdobanv.com/LanitechArtwork/button_home_on.gif', dropdownmenu(this, event, 'anylinkmenu1');"
The problem is the fact that you've given your Image objects the same names as your actual images. If you change the names of these:
Code:
image1 = new Image();
image1.src = "http://www.qdobanv.com/LanitechArtwork/button_home_on.gif";
image2 = new Image();
image2.src = "http://www.qdobanv.com/LanitechArtwork/button_menu_on.gif";
image3 = new Image();
image3.src = "http://www.lanitech.com/ArtworkNew/Button-Portfolio-On.gif";
image4 = new Image();
image4.src = "http://www.lanitech.com/ArtworkNew/Button-RequestAQuote-On.gif";
image5 = new Image();
image5.src = "http://www.lanitech.com/ArtworkNew/Button-Contact-On.gif";
so that they don't conflict with the actual HTML images, you'll be fine.
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