java script error - object not found

I have this code

<asp:HyperLink ID="hlMainImageChange"
                                              NavigateUrl="javascript:ImageChange('main', 'change');" runat="server">Change</asp:HyperLink>


That tries to call this code:

 function ImageChange(strImgType, strFunction) {

        var WinSettings = "center:yes;resizable:no;dialogHeight:300px"
     
        var MyArgs = window.showModalDialog("../change_file.aspx?Product_ID=" + prodid + "&ImageType=" + strImgType + "&FunctionType=" + strFunction, MyArgs, WinSettings)

    }


 but does not make it there because i get a error

Microsoft JScript runtime error: Object expected



vbnetcoderAsked:
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
You're trying to use "MyArgs" in the line that defines it.  I don't think that works.

var MyArgs = window.showModalDialog("../change_file.aspx?Product_ID=" + prodid + "&ImageType=" + strImgType + "&FunctionType=" + strFunction, MyArgs, WinSettings)
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vbnetcoderAuthor Commented:
It was working fine in Google Chrome
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
Then it is passing a 'null' in Chrome and that is what Microsoft Jscript is objecting to.  Every browser has it's own javascript interpreter with it's own differences and Microsoft's Jscript in IE8 seems to be the pickiest.
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vbnetcoderAuthor Commented:
ty
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