Web controls in IE 6

I'm trying to use a calender control and for the onselectedchanged event I call a function that simply takes the value and puts it in a textbox control. I also have the Autopostback = true. I've used this on other sites on other machines and it works fine. This machine has IE6. When I view the page IE declares that there is a javascript error. I don't have any javascript that I created. The only JS thats there is from what .NET created. I also get a similar error when I try to use a series of radio buttons on the page. Is IE 6 this the reason that it doesn't work? Thanks, -Jordan ...