var imageFiles_1si_1 = new Array();
imageFiles_1si_1['0'] = new Array ('_images/1si_Product_Options.gif', '_images/1si_Product_OptionsMouseover.gif');
imageFiles_1si_1['1'] = new Array ('_images/1si_Block_Features.gif', '_images/1si_Block_FeaturesMouseover.gif');
imageFiles_1si_1['2'] = new Array ('_images/1si_Block_Types.gif', '_images/1si_Block_TypesMouseover.gif');
imageFiles_1si_1['3'] = new Array ('_images/1si_More_Precast.gif', '_images/1si_More_PrecastMouseover.gif');
imageFiles_1si_1['4'] = new Array ('_images/1si_Advanced_Walls.gif', '_images/1si_Advanced_WallsMouseover.gif');
imageFiles_1si_1['5'] = new Array ('_images/1si_Home.gif', '_images/1si_HomeMouseover.gif');

function image_on_1si_1 (position) {
   var doc = eval("document.image1si_1" + position);
   doc.src = imageFiles_1si_1[position][1];
}

function image_off_1si_1 (position) {
   var doc = eval("document.image1si_1" + position);
   doc.src = imageFiles_1si_1[position][0];
}