function pg_ld(){
	num = 7;
	images = new Array();
	for(i = 0; i < num; i ++){
		images[i] = new Image();
		images[i].src = "../img/bt/bt_" + i + "_1.gif";
	}
}

function pg_ld_index(){
	num = 2;
	images = new Array();
	for(i = 0; i < num; i ++){
		images[i] = new Image();
	}
	images[0].src = "img/bt/enter_1.gif";
	images[1].src = "img/bt/exit_1.gif";
}
function pg_ld_admin(){
	num = 3;
	images = new Array();
	for(i = 0; i < num; i ++){
		images[i] = new Image();
	}
	images[0].src = "admin/img/schedule_1.gif";
	images[1].src = "admin/img/access_1.gif";
	images[2].src = "admin/img/mail_1.gif";
}
function img_ch(ad,fl){
	document.getElementById(ad).src = fl;
}
function bt_ch(ad,fl){
	document.getElementById("img_bt_" + ad).src = "../img/bt/bt_" + ad + "_" + fl + ".gif";
}