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In JavaScript within a JSP, is there a way to open a Save As dialog box?

Can anyone tell me how to open a Save As Dialog Box in JSP?

<a href="#" onClick="doSave()"> <img src="save.gif" alt="Save As"></a>

I need to eliminate doSave in JavaScript and I have to implement this in a JSP. I searched and the execCommand is not supported in Netscape browsers. Please provide a solution that is cross browser compatible. I have lost my two days with googling on this. :( :(

We can't raise save as option automatically using jsp.Because save as is a client side option. Only solution i got (without writing js) is the user have to save the file/image using right click say "save as".

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