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null or not an object error in IE works perfectly in Firefox

 
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I have a method which works fine in FF, however in IE, I get a null or not an object error. Here is the code, IE complain about parameter lp which I pass value from another method.

>
 
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Which line?
 
Phoebe Song
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line 13, lp.toLowerCase(), IE complains lp is null or not an object.
 
Bear Bibeault
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So what is lp when the error occurs?
 
Phoebe Song
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doLoadDictionary function is called by another function, lp is parameter passed from the calling function. Here is the calling function.



last line calls function doLoadDictionary, lp is a string, value is language name.

 
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Any one know what's the problem?
 
Bear Bibeault
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You didn't answer my question. What is the value of lp when it fails?
 
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