function get_id_num(a,b) {
	k_a = a.length;
	k_b = b.length;
	m = a.substr((k_b),(k_a-1));
	return m;
}

function move_to(a) {
	document.location.href=a;
}

function preload_images()
{
	var a = preload_images.arguments;
	var j = a.length;
	var img_new = new Array;
	for(i=0;i<j;i++)
	{
		img_new[i] = new Image;
		img_new[i].src = a[i];
	}
}

function op_win(addr,w,h)
{
	var sc_h = screen.availHeight;
	var sc_w = screen.availWidth;
	
	sc_h = parseInt((sc_h - h)/2);
	sc_w = parseInt((sc_w - w)/2);
	
	if ((navigator.userAgent.indexOf('Opera') != -1)&&(navigator.userAgent.indexOf('MSIE') != -1))
	{
		sc_h = sc_h - ((screen.availHeight - document.body.clientHeight) - 29);
	}
	
	var margins="left="+sc_w+",top="+sc_h;

	window.open(addr,"","toolbars=0,scrollbars=1,directories=0,resizable=1,status=0,width=" + w + ",height=" + h + "," + margins);
}