function popup(url){
	w=720;
	h=600;
	if(screen.width){
		var winl = (screen.width-w)/2;
		var wint = (screen.height-h)/2;
	}else{winl = 0;wint =0;}
	if (winl < 0) winl = 0;
	if (wint < 0) wint = 0;
	var settings = 'status = 1, resizable = 0, height=' + h + ',';
	settings += 'width=' + w + ',';
	settings += 'top=' + wint + ',';
	settings += 'left=' + winl;
	//alert (settings);
	mywindow = window.open(url,'myWindow', settings );
}