var imageFiles_4_19 = new Array();
imageFiles_4_19['0'] = new Array ('_images/4_Ask_the_Expert.gif', '_images/4_Ask_the_ExpertMouseover.gif');

function image_on_4_19 (position) {
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   doc.src = imageFiles_4_19[position][1];
}

function image_off_4_19 (position) {
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   doc.src = imageFiles_4_19[position][0];
}