You could add a tool tip script. That's a little tricky though, so I'll get back to it later if we need to. The easiest thing to do would be to give your images in the 'train' a title attribute:
Code:
leftrightslide[0]='<a href="http://"><img title="Title for this Image" src="dynamicbook1.gif" border=1></a>'
leftrightslide[1]='<a href="http://"><img title="Title for this Image" src="dynamicbook2.gif" border=1></a>'
leftrightslide[2]='<a href="http://"><img title="Title for this Image" src="dynamicbook3.gif" border=1></a>'
leftrightslide[3]='<a href="http://"><img title="Title for this Image" src="dynamicbook4.gif" border=1></a>'
leftrightslide[4]='<a href="http://"><img title="Title for this Image" src="dynamicbook5.gif" border=1></a>'
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