It's because you are referencing them to images on your local machine.
Compare the code, you'll see that the button's that show up look like this:
<img border="0" id="img4" src="button1.jpg" height="33" width="100"
alt="Qualifications"
onmouseover="FP_swapImg(1,0,/*id*/'img4',/*url*/'button2.jpg')"
onmouseout="FP_swapImg(0,0,/*id*/'img4',/*url*/'button1.jpg')"
onmousedown="FP_swapImg(1,0,/*id*/'img4',/*url*/'button3.jpg')"
onmouseup="FP_swapImg(0,0,/*id*/'img4',/*url*/'button2.jpg')"
fp-style="fp-btn: Embossed Tab 1" fp-title="Qualifications"></a><a
href="gallery.htm"> <img border="0" id="img5" src="button15.jpg" height="33"
width="100" alt="Patterns" fp-style="fp-btn: Embossed Tab 1"
fp-title="Patterns"
onmouseover="FP_swapImg(1,0,/*id*/'img5',/*url*/'button4.jpg')"
onmouseout="FP_swapImg(0,0,/*id*/'img5',/*url*/'button15.jpg')"
onmousedown="FP_swapImg(1,0,/*id*/'img5',/*url*/'button5.jpg')"
onmouseup="FP_swapImg(0,0,/*id*/'img5',/*url*/'button4.jpg')"></a>
<a href="gallery2.htm">
and the ones that don't look like this:
<img border="0" id="img26"
src="file:///C:/Documents%20and%20Settings/Janiece%20%20Walsh/Local%20Settings/Temporary%20Internet%20Files/FrontPageTempDir/button15.jpg"
height="33" width="100" alt="Gallery"
onmouseover="FP_swapImg(1,0,/*id*/'img26',/*url*/'file:///C:/Documents%20and%20Settings/Janiece%20%20Walsh/Local%20Settings/Temporary%20Internet%20Files/FrontPageTempDir/button16.jpg')"
onmouseout="FP_swapImg(0,0,/*id*/'img26',/*url*/'file:///C:/Documents%20and%20Settings/Janiece%20%20Walsh/Local%20Settings/Temporary%20Internet%20Files/FrontPageTempDir/button15.jpg')"
onmousedown="FP_swapImg(1,0,/*id*/'img26',/*url*/'file:///C:/Documents%20and%20Settings/Janiece%20%20Walsh/Local%20Settings/Temporary%20Internet%20Files/FrontPageTempDir/button17.jpg')"
onmouseup="FP_swapImg(0,0,/*id*/'img26',/*url*/'file:///C:/Documents%20and%20Settings/Janiece%20%20Walsh/Local%20Settings/Temporary%20Internet%20Files/FrontPageTempDir/button16.jpg')"
fp-style="fp-btn: Embossed Tab 1" fp-title="Gallery"></a>
<a href="brochure.htm">
See the "src=" part? you need to fix that.