In each slide position you have a height:-
........<td colspan="4" align="left"><div style="overflow: hidden;
visibility: visible; height: 560px;" id="slidedesc1"
class="slide_desc" align="left">
<p> Reliability:.........
This obviously isn't enough so increase each height. Different browsers have different default font sizes and someone might increase font size, so allow a bit of space at the bottom.
Code downloaded to my PC will be deleted in due course.
WIN7; IE9, Firefox, Opera, Chrome and Safari for Windows; screen resolution usually 1366*768.
Also IE6 on W98 with 800*600 and IE8 on Vista 1440*900.