How to set style !important using javascript??

i can set an items width using js
page_item.style.width = "400";
how do i incorporate the "!important" flag in this statement?

Hi Craig,
Here's the only blurb I could find on this:
http://msdn.microsoft.com/library/default.asp?url=/workshop/author/dhtml/reference/properties/important.asp
Notice the "Scripting: N/A" bit at the top.
I use this site a lot - not because I'm particularly keen on MS/IE but because at the bottom of each entry you get confirmation of whether or not the setting/attribute/etc is standard or not and the pages are kept up to date.
I have to say that this is only the second time I've come across someone trying to use this. The first time we just decided to leave it. I can see the importance of using it to stop someone overriding styling, but as I mentioned above, it is possible to create an entire script tag using javascript and, therefore, you can override it. Seems silly to me, but there you go!
It would also be better, in my view, if they had used a better word for this setting - something like java's "final" - as, the first time I saw it I took it to mean "make more bolder" or "highlight it" or somesuch thing.
Regards
Andy

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