I am using jQuery and put this code in my javascript:
function HideMe(itemID) { var myDiv = \'item_\' + itemID; $(myDiv).fadeOut(\"slow\"); }
Do you have another javascript library on that page? It seems you have the hide function, and the $ defined (prototype, for example, also has an hide function). If that is the case, try:
hide
$
jQuery("#item_0").fadeOut("slow");