function print()
    {
        var win = window.showModalDialog("print.aspx ", "打印预览窗口","dialogWidth=698px,dialogHeight=650px");
    }
<asp:Button ID="btnPrint" runat="server" Text="打印" OnClientClick="print();"  />
--------------------------------------------------------------------------------------------
 function openfhr()   
  {   
       var result = window.showModalDialog("fhrxm.aspx ", "发货人选择窗口","scrollbars=no,resizable=no,top=0,left=0,dialogwidth=250px,dialogheight=150px");
} <asp:Button ID="btnfhr" runat="server" Text="..." CssClass="btn" OnClientClick="openfhr();" />为什么下面弹出的窗口有标题 ,上面的却没有呢?????????????
百思不得其解?