function Prepare(strImageName, strUrl) {
	document.images[strImageName] = new Image();
	document.images[strImageName].src = strUrl;
}

function SwapImage(strImageName, strUrl) {
	document.images[strImageName].src = strUrl;
}
// MouseOver IMG
Prepare('company','./images/company_u.gif');
Prepare('cominfo','./images/cominfo_u.gif');
Prepare('contact','./images/contact_u.gif');
Prepare('menu_01','./images/menu_01_u.gif');
Prepare('menu_02','./images/menu_02_u.gif');
Prepare('cont_01','./images/cont_01_u.gif');
Prepare('cont_02','./images/cont_02_u.gif');
Prepare('cont_03','./images/cont_03_u.gif');
Prepare('cont_04','./images/cont_04_u.gif');
// MouseOut IMG
Prepare('company','./images/company_d.gif');
Prepare('cominfo','./images/cominfo_d.gif');
Prepare('contact','./images/contact_d.gif');
Prepare('menu_01','./images/menu_01_d.gif');
Prepare('menu_02','./images/menu_02_d.gif');
Prepare('cont_01','./images/cont_01_d.gif');
Prepare('cont_02','./images/cont_02_d.gif');
Prepare('cont_03','./images/cont_03_d.gif');
Prepare('cont_04','./images/cont_04_d.gif');