function invest_popup(url){
if(url.toLowerCase().indexOf(".pdf")>0||url.toLowerCase().indexOf(".exe")>0||url.toLowerCase().indexOf(".zip")>0||url.toLowerCase().indexOf(".doc")>0)
{
window.open(url);
} else {
var swidth=600;
var sheight=400;
var stop=screen.height-sheight-60;
var sleft=screen.width-swidth-20;
var my_popup_window = window.open('','popupwn','width='+swidth+',height='+sheight+',top='+stop+',left='+sleft+',resizable=yes,scrollbars=yes');
my_popup_window.document.open();
my_popup_window.document.write('上海证券交易所投资者教育网站');
my_popup_window.document.write('');
my_popup_window.document.write('');
my_popup_window.document.close();
my_popup_window.focus();
}
}