there is one more thing which i forgot to mention earlier... if i encounter an IE specific error the first thing i do is disable all debugging addons in IE, restore all the advanced options to default.
open the source code in IE of your colleague(on whose computer it is working fine). open the source code in IE of your computer. compare that line by line (use tortoise merge or kdiff) if they dont match... probably u'll be able to find the error. if they do match .. that is a configuration prob in your IE(if this is the case i recommend you to forget the error and move on) and finally .. as far as i know both web developer console and firebug console show the same (javascript) errors as that of inbuilt firefox console. they only differ when ter is a page refresh. firebug console does not "remember" javascript errors of previous pages opened in that browser. while web developer console shows "all" javascript errors occoured till then.
