if (document.images) {
image0 = new Image;
image1 = new Image;
image2 = new Image;
image3 = new Image;
image0.src = 'img/execstats_regular.jpg';
image1.src = 'img/execstats_crosstab.jpg';
image2.src = 'img/execstats_chart.jpg';
image3.src = 'img/execstats_excel.jpg';
} else {
image0 = '';
image1 = '';
image2 = '';
image3 = '';
document.rollimg = '';
}