function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		global_menu_p_over = newImage("common_images/global-menu_p-over.gif");
		global_menu_r_over = newImage("common_images/global-menu_r-over.gif");
		global_menu_e_over = newImage("common_images/global-menu_e-over.gif");
		global_menu_a_over = newImage("common_images/global-menu_a-over.gif");
		global_menu_f_over = newImage("common_images/global-menu_f-over.gif");
		left_navi_1_over = newImage("images/left_navi_1-over.gif");
		left_navi_2_over = newImage("images/left_navi_2-over.gif");
		left_navi_3_over = newImage("images/left_navi_3-over.gif");
		left_navi_4_over = newImage("images/left_navi_4-over.gif");
		left_navi_5_over = newImage("images/left_navi_5-over.gif");
		left_navi_6_over = newImage("images/left_navi_6-over.gif");
		left_navi_7_over = newImage("images/left_navi_5-over.gif");
		left_navi_8_over = newImage("images/left_navi_6-over.gif");
		preloadFlag = true;
	}
}




function OpenMenu(id){ 
   document.getElementById( id ).style.visibility = 'visible';
}
function CloseMenu(id){
   document.getElementById( id ).style.visibility = 'hidden';
}