firefox compatability

i want to disable tab im using this code
document.getElementById('tabxyz').disabled="true";
it is working ie8 and it is not working in firefox10
any alternative solution for this?
LVL 2
srikoteshAsked:
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Tom BeckConnect With a Mentor Commented:
Your tab is a table cell. It does not have a disable attribute like a button or textbox. Without changing to a standard input element, I would say what you have is workable.
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Tom BeckCommented:
Can you elaborate a little. What do you mean by a "tab". What is the actual html element? Can you provide more context?
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srikoteshAuthor Commented:
<table cellpadding="0" cellspacing="0"  width="780px" border="0">
                                            <tr style="height:22px">
                                                <td id="Testtab1ControlObjM" class="TabItemStyleOn" style="width:150px; height:22px;" onclick="tabClicked('Test',1,3);" align="center">General</td>
                                                <td id="Testtab1ControlObjR" class="TabItemStyleOnOff" style="width:25px; height:22px;"></td>
                                                <td id="Testtab2ControlObjM" name="Testtab2ControlObjM" class="TabItemStyleOff" style="width:130px;height:22px;" onclick="tabClicked('Test',2,3);" align="center" >Medical</td>
                                                <td id="Testtab2ControlObjR" name="Testtab2ControlObjR"  class="TabItemStyleOffOff" style="width:25px; height:22px;"></td>
 </tr>
 </table>


document.getElementById('Testtab2ControlObjM').disabled = true;                        
document.getElementById('Testtab2ControlObjR').disabled = true;

im using like this it working in ie showing the tab in disable mode, but problem with ffox
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Tom BeckCommented:
Try this:

document.getElementById('Testtab2ControlObjM').removeAttribute("onclick");                        
document.getElementById('Testtab2ControlObjR').removeAttribute("onclick");

If you need to re-enable them do this:

document.getElementById('Testtab2ControlObjM').setAttribute("onclick", "tabClicked('Test',2,3);");                        
document.getElementById('Testtab2ControlObjR').setAttribute("onclick","tabClicked('Test',2,3);");
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srikoteshAuthor Commented:
yes this code is working fine but tab has to show disable mode
for that i added another line is there any alternative instead of that line

 document.getElementById('Testtab2ControlObjM').style.color='Gray';                          document.getElementById('Testtab2ControlObjM').removeAttribute("onclick");                
                          document.getElementById('Testtab2ControlObjR').removeAttribute("onclick");
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