function doPreload()
{

 var the_images = new Array('http://www.kagaku21.net/laboratory2/images/textmenu01_o.gif','http://www.kagaku21.net/laboratory2/images/textmenu02_o.gif','http://www.kagaku21.net/laboratory2/images/textmenu03_o.gif','http://www.kagaku21.net/laboratory2/images/textmenu04_o.gif','http://www.kagaku21.net/laboratory2/images/textmenu05_o.gif','http://www.kagaku21.net/laboratory2/images/header_02_o.gif','http://www.kagaku21.net/laboratory2/images/textmenu_07_o.gif','http://www.kagaku21.net/laboratory2/images/textmenu_08_o.gif','http://www.kagaku21.net/laboratory2/images/textmenu_09_o.gif','http://www.kagaku21.net/laboratory2/images/textmenu06_o.gif','http://www.kagaku21.net/laboratory2/images/m_herb_soap_o.gif','http://www.kagaku21.net/laboratory2/images/m_denki_pan_o.gif','http://www.kagaku21.net/laboratory2/images/m_hand_note_o.gif','http://www.kagaku21.net/laboratory2/images/m_aizome_o.gif');
 
 preloadImages(the_images);
}
function preloadImages(the_images_array) {
 for(loop = 0; loop < the_images_array.length; loop++)
 {
     var an_image = new Image();
  an_image.src = the_images_array[loop];
 }
}