var preloadImagelist = new Array(
'shared/image/m_contact_on.gif',
'shared/image/m_method_on.gif',
'shared/image/m_profile_on.gif',
'shared/image/m_schedule_on.gif',
'shared/image/m_students_on.gif',
'shared/image/b_contact_on.gif');

function loadimage(dir) {
var pimg = new Array();
for(i = 0; i < preloadImagelist.length; i++) {
pimg[i] = new Image();
pimg[i].src = dir + preloadImagelist[i];
}
}