function popUp(URL) {
day = new Date();
id = day.getTime();

if (document.all || document.layers) {
	w = screen.availWidth;
} else {
	w = 1024;
}

var popW = 500;

var leftPos = (w-popW)/2;

eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=1,titlebar=0,directories=0,location=0,statusbar=0,menubar=0,resizable=0,width=500,height=520,left=' + leftPos + ',top = 100');");
}