IE display problems using protoype.js

[phpnewbie]

this is a recent problem but I'm using scriptaculous on a site and
this week all the IE browsers are not displaying any content. The
stated error is:

Message: Unable to get value of the property 'replace': object is null
or undefined
Line: 1400
Char: 13
Code: 0

This is on the prototype.js file (version 1.5.0)

all other browsers are fine

any ideas on how to fix it would be much appeciated

thanks

[Victor]

This is on the prototype.js file (version 1.5.0)

all other browsers are fine

Do you have tried to update to newest Prototype and Scriptaculous versions?

Also you maybe forgot to use $() on element before invoking methods from Prototype and Scripty - this is common problem in IE.