Javascript Equivalent of Set??

[admin]

I need to find the javascript equivalent of this vbscript statement:

Set objChild = Document.All("C" & Mid(strParentId, 3))

It is for a menu where I dont know how many elements there will be with that ID. I then set the visibility with

objChild.Style.Display = ""
or
objChild.Style.Display = "none"


I need to convert this menu from IE only to being cross browser compliant.

thanks for any and all help!