internet explorer script error

hi i have a problem about chating evry letter that i writte when i send it inever see the word in the window end evrytime that i chose the name end i open it always internet explorer script error pls help me about this
line:2499
char:21
error:unexpected quantifier
code:0
URL:file://C:\program file\yahoo!\messenger\TMPIMV1.tmp

Are you running the lastest browser, IE7 or Firefox 2

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