var imageFiles_4l_1 = new Array();
imageFiles_4l_1['0'] = new Array ('_images/4l_Septic_Plumbing.gif', '_images/4l_Septic_PlumbingMouseover.gif');
imageFiles_4l_1['1'] = new Array ('_images/4l_Septic_Installation.gif', '_images/4l_Septic_InstallationMouseover.gif');
imageFiles_4l_1['2'] = new Array ('_images/4l_Sewer___Drain.gif', '_images/4l_Sewer___DrainMouseover.gif');

function image_on_4l_1 (position) {
   var doc = eval("document.image4l_1" + position);
   doc.src = imageFiles_4l_1[position][1];
}

function image_off_4l_1 (position) {
   var doc = eval("document.image4l_1" + position);
   doc.src = imageFiles_4l_1[position][0];
}