file upload not working in safari for mac only

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ASP.NET

ASP.NET4

Hi,

I am using file upload control in ASP.NET.
The problem is that its working for all browsers in Windows even its working in safari for Windows also.
But it doesn't work only in safari for Mac

Following is the code mark up:

<asp:FileUpload runat="server" ID="Pic1" />
<asp:RequiredFieldValidator runat="server" ID="pic1required" CssClass="RequiredError" Display="Dynamic" ControlToValidate="Pic1" ErrorMessage="You must upload a first picture." />
<br />
<asp:FileUpload runat="server" ID="Pic2" />
<asp:RequiredFieldValidator runat="server" ID="pic2required" CssClass="RequiredError" Display="Dynamic" ControlToValidate="Pic2" ErrorMessage="You must upload second a picture." />