function open_win(win_file, win_title, win_width, win_height) {
	win_width = win_width + 20;
	win_height = win_height + 20;
	window.open(win_file, win_title, 'resizable=yes,width='+win_width+',height='+win_height+',toolbar=yes,scrollbars=yes,location=no,menubar=no,status=no');
}

function setVisible(me) {
	me.style.visibility="visible";
}

function setInvisible(me) {
	me.style.visibility="hidden";
}