Java Script not working on Internet Explorer

[Tanzil Ahmed]

I have implemented a java script on example.com index page to make a search of cars can any body help me with this.

The options are working very well at firefox but they are not working on internet explorer can any body point me out the deficiency in this option.

The error as appeared in internet explorer are

Webpage Script Errors

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; InfoPath.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
Timestamp: Sun, 14 Dec 2008 08:06:51 UTC

Message: 'document.getElementById(...)' is null or not an object
Line: 31
Char: 3
Code: 0
URI: http://www.example.com/files/ajax.js

Message: Object doesn't support this property or method
Line: 308
Char: 2
Code: 0
URI: http://www.example.com/index.php

Message: Object doesn't support this property or method
Line: 54
Char: 3
Code: 0
URI: http://www.example.com/files/ajax.js

[edited by: eelixduppy at 10:21 pm (utc) on Dec. 15, 2008]
[edit reason] exemplified [/edit]

[Tanzil Ahmed]

I resolved it by my self thanks