this is the code,it is not working in Firefox,Chrome,to show full size image unless user click on image for couple of times, I basically replace the thmbnail image with full size image in javascript,
here is my code,
TransitionDuration="50" FramesPerSecond="40" RequireOpenedPane="false" SelectedIndex="-1" SuppressHeaderPostbacks="true" HeaderCssClass="accordionHeader" ContentCssClass="accordionContent"  OnItemDataBound="Accordion1_ItemDataBound" OnItemCommand="Accordion1_ItemCommand" 
 
  
' 
  
  
 
 
' 
Width="90px" Height="70px" onclick="togglePopupImage2(this);" CssClass="thumbnail" 
BorderColor="Navy" BorderStyle="Solid" BorderWidth="1" 
 
 
 
        <table>
            <tr>
                <td style="background-color: #2E4d7B; height: 15px; color: White; font: arial bold 12px;
                    padding: 5px">
                    <label id="imgText" runat="server">
                    </label>
                </td>
            </tr>
            <tr>
                <td>                        
                    <asp:Image ID="imgPopup" CssClass="imgpopup" runat="server" />
                </td>
            </tr>
            <tr>
                <td align="center" style="background-color: #2E4d7B; height: 25px;">
                    <asp:Button ID="btnCancel" runat="server" Text="Close" CssClass="closeimage"/>
                </td>
            </tr>
        </table>
    </asp:Panel>
And javascript code:
function togglePopupImage2(thumbnail2) {
    var imageurl = thumbnail2.src;
    var temp = new Array();
    temp = imageurl.split('.');
var imagepopup = temp[0].substring(0, temp[0].length - 3) + "." + temp[1]; 
    var img = new Image();
    img.src = imagepopup;
    $get('ctl00_MainContentCPH_UserInterfaceID').style.visibility = 'visible';
    $get('ctl00_MainContentCPH_imgPopup').src = img.src;
    //alert(img.src);
    if (img.width > 750) {
        if (screen.width == '1024' || screen.width == '800') {
            $get('ctl00_MainContentCPH_imgPopup').width = 550;  //to show the picture in 1024 or 800 resolutions
        }
        else {
            $get('ctl00_MainContentCPH_imgPopup').width = 750;
        }
    }
    else {
        $get('ctl00_MainContentCPH_imgPopup').width = img.width;
    }
    if (img.height > 568) {
        if (screen.width == '1024' || screen.width == '800') {
            $get('ctl00_MainContentCPH_imgPopup').height = 350;  //to show the picture in 1024 or 800 resolutions
        }
        else {
            $get('ctl00_MainContentCPH_imgPopup').height = 568;
        }
    }
    else {
        $get('ctl00_MainContentCPH_imgPopup').height = img.height;
    }
//    }
}
Please find the error and let me know what is the right way to achieve this?
Thanks in advance