function popup(url,title,height,width){
	
	if (! height){ height = 350; }		

	if (! width){ width = 450; }

	var str_options = 'width=' + width + ',height=' + height + ',resizable,scrollbars';

	str_options = str_options + ',left=300,top=300';

	var imgWindow = window.open(url,title,str_options);
	imgWindow.focus();
}