var myWin = null;
function gen_popup(theUrl, theTitle, theDim) {
	if ((! myWin) || (myWin.closed)) {
		if (! theDim) {
			theDim = 'width=500,height=300,left=5,top=5,scrollbars=yes';
		}
		myWin = window.open(theUrl, theTitle, theDim);
		myWin.opener = window;
	} else {
		myWin.location = theUrl;
		myWin.focus();
		myWin.opener = window;
	}
}