Script: Image Thumbnail Viewer II

Hi guys,

At the start of the scirpt where the big picture details are put in, is there a way to change their size from the image's defaults?
i.e. for below how would I set the size of image1?:

var dynimages=new Array()
dynimages[1]=["image2.jpg", ""]
dynimages[2]=["../dynamicindex14/photo3.jpg", ""]
dynimages[3]=["bs00847a.gif", ""]
dynimages[4]=["bs00825a.gif", ""]
dynimages[5]=["hh01478a.gif", ""]