function chg_button(titlename, onoff) 
{
	document[titlename].src = "images/button_" + titlename + "_" + onoff + ".gif"
}

function open_window (page) {

date = new Date();
counter = Math.floor((date.getSeconds()/60)*100);

	new_window = window.open (page,"a" + counter + "a","width=780,height=450,toolbar=no,location=no,scrollbars=yes,directories=no,menubar=no,resizable=yes");
}